EP4689446A1 - Carter fixe pour un reducteur mecanique d'aeronef - Google Patents
Carter fixe pour un reducteur mecanique d'aeronefInfo
- Publication number
- EP4689446A1 EP4689446A1 EP24722676.4A EP24722676A EP4689446A1 EP 4689446 A1 EP4689446 A1 EP 4689446A1 EP 24722676 A EP24722676 A EP 24722676A EP 4689446 A1 EP4689446 A1 EP 4689446A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reducer
- crown
- deflector
- housing
- casing
- 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
-
- 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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/36—Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/042—Guidance of lubricant
- F16H57/0421—Guidance of lubricant on or within the casing, e.g. shields or baffles for collecting lubricant, tubes, pipes, grooves, channels or the like
- F16H57/0423—Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0457—Splash lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0482—Gearings with gears having orbital motion
- F16H57/0486—Gearings with gears having orbital motion with fixed gear ratio
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/405—Powered wheels, e.g. for taxing
-
- 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
- B64D27/02—Aircraft characterised by the type or position of power plants
- B64D27/10—Aircraft characterised by the type or position of power plants of gas-turbine type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/40—Transmission of power
- F05D2260/403—Transmission of power through the shape of the drive components
- F05D2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
- F05D2260/40311—Transmission of power through the shape of the drive components as in toothed gearing of the epicyclical, planetary or differential type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H2001/2872—Toothed gearings for conveying rotary motion with gears having orbital motion comprising three central gears, i.e. ring or sun gear, engaged by at least one common orbital gear mounted on an idling carrier
Definitions
- the present invention relates to a fixed casing for an aircraft mechanical reducer, and in particular for an aircraft turbomachine or for a drive system for a wheel of an aircraft landing gear.
- the state of the art includes in particular documents FR-A1 -3 025 780, FR-B1 -3 066 792, FR-B1 -3 071 023, FR-3 072 749, FR-B1 -3 098 562, FR -B1 - 3,101,129, EP-A1 -2,834,503, US-A-4,864,893 and US-A-10,807,467.
- the role of a mechanical reducer is to modify the speed and torque ratio between the input axis and the output axis of a mechanical system.
- New generations of dual-flow turbomachines particularly those with a high bypass ratio, include a mechanical reducer to drive the shaft of a fan.
- the reducer is intended to transform the so-called fast rotation speed of the shaft of a power turbine into a slower rotation speed for the shaft driving the fan.
- a drive system for a wheel of a landing gear may further comprise a mechanical reducer, as proposed by the Applicant in document EP-A1-3 882 136.
- Such a reducer comprises a central pinion, called a sun gear, a crown gear and pinions called satellites, which are engaged between the sun gear and the crown gear.
- the satellites are held by a frame called a satellite carrier.
- the sun gear, the crown gear and the satellite carrier are planetary gears because their axes of revolution coincide with the axis of the turbomachine or the wheel of a landing gear.
- the satellites each have an axis of different revolutions equally distributed on the same operating diameter around the axis of the planets. These axes are parallel to the longitudinal axis X.
- reducers are of the planetary or epicyclic type.
- differential or compound architectures there are so-called differential or “compound” architectures.
- the planet carrier On a planetary reducer, the planet carrier is fixed and the crown constitutes the output shaft of the device which rotates in the opposite direction to the solar.
- the crown is fixed and the planet carrier constitutes the output shaft of the device which rotates in the same direction as the solar.
- Gearboxes can be composed of one or more meshing stages. This meshing is ensured in different ways such as by contact, by friction or by magnetic fields. There are several types of contact meshing such as with straight, helical or herringbone teeth.
- Gearboxes can be composed of one or more meshing stages. This meshing is ensured in different ways such as by contact, by friction or by magnetic fields.
- a satellite may comprise one or two meshing stages.
- stage or “toothing” means a series of meshing teeth with a series of complementary teeth. Toothing may be internal or external.
- a single-stage satellite comprises toothing which may be straight, helical or herringbone and whose teeth are located on the same diameter. This toothing cooperates with both the sun and the crown.
- a double-stage satellite consists of two sets of teeth or two series of teeth that are located on different diameters. A first set of teeth cooperates with the sun gear and a second set of teeth cooperates with the crown gear.
- the reducer thus comprises two crowns, one of which is fixed and the other mobile.
- a mechanical reducer must be lubricated to ensure its operation and also to evacuate the calories generated during operation.
- lubricating oil is used.
- the first technology consists of lubricating the reducer by oil jets.
- the jets are supplied with oil and spray oil onto the gears, i.e. the teeth of the solar, the satellites and the crown(s). This oil is then evacuated and recovered for recycling.
- Another technology is to use an oil splash reducer.
- the oil is permanently present in the reducer which includes a sealed enclosure for retaining this oil.
- the oil level in the reducer enclosure is such that at least part of the satellites, the satellite carrier, and the crown(s) splash in the oil, i.e. is permanently bathed in oil.
- a splash reducer In a splash reducer, by gravity, the oil flows and is stored in the lower part of the enclosure and the reducer. Therefore, the teeth located in the lower part are immersed in oil while the teeth in the upper part are not immersed in oil. During operation, the rotating elements contained in the enclosure rotate at high speeds and carry the oil. The oil tends to be centrifuged and form an oil ring inside the enclosure.
- One of the problems with a mechanical splash reducer is ensuring that all of its gears are well lubricated.
- the invention provides a simple, effective and economical solution to this problem.
- the invention relates to a fixed casing for a mechanical splash reducer, in particular for an aircraft, this casing having an annular shape around a longitudinal axis and comprising:
- annular wall extending around the axis and having its external periphery connected to the cylindrical wall, this annular wall comprising a second annular surface connected to the first surface, said first and second surfaces defining an annular space configured to receive an oil ring, in particular a splash ring, characterized in that it further comprises at least one oil deflector projecting from at least one of said first and second surfaces.
- an oil ring forms around the reducer and in particular inside the enclosure and the casing forming this enclosure.
- the oil ring is located at the annular space of the casing, on the aforementioned surfaces.
- the invention makes it possible to detach the oil from the casing and to divert this oil towards gears or elements to be lubricated of the reducer.
- the casing comprises at least one oil deflector intended to be located at this oil ring.
- the solution proposed below is compatible with a single-stage or multi-stage reducer. It is compatible with a planetary, epicyclic, differential or Wolfrom type reducer. It is also compatible with straight, helical or herringbone teeth. It is compatible with any type of planet carrier, and in particular a single-piece planet carrier. It is also compatible with any type of bearing, whether it is composed of rolling elements, a hydrodynamic bearing, etc. It is compatible with use of the crown and the reducer in a dual-flow turbomachine, for example for driving a fan or a propeller. It is also compatible with use of the crown and the reducer in a system for driving a wheel of a landing gear.
- the housing according to the invention may comprise one or more of the following characteristics, taken in isolation from one another, or in combination with one another:
- the housing comprises a single deflector which is located on said first surface, or even also on said second surface;
- the deflector is located at 12 o'clock by analogy with the dial of a clock when the housing is in the position of use in which said longitudinal axis is horizontal;
- each deflector has a generally elongated shape, in particular along said longitudinal axis;
- each baffle extends from the second surface to the flange
- each deflector has a generally triangular cross-section shape
- the or each deflector comprises a first side oriented in a circumferential direction, which has a concave curved shape, and optionally a second side oriented in an opposite circumferential direction, which has a concave curved shape;
- the sides of the or each deflector have different curved shapes and in particular curved shapes having different radii of curvature;
- each deflector has the shape of an arrowhead, one base of which is connected to the second surface and the point is located on the flange side, or conversely, the base of which is located on the flange side and the point is located on the second surface side;
- the two lateral surfaces form an angle between them greater than 90 and less than 180°, measured in a plane perpendicular to the longitudinal axis;
- the two lateral surfaces form an angle between them of less than 90, measured in a plane perpendicular to the longitudinal axis; these surfaces may be parallel.
- the present invention also relates to a mechanical reducer, in particular for an aircraft, this reducer comprising:
- satellites mounted between the sun and the crown and meshed with the sun and the crown, these satellites having axes of rotation parallel to said axis and being carried by a satellite carrier, and
- the satellites are double-stage and comprise a first stage meshed with the first crown which is movable around said longitudinal axis and the sun, and a second stage meshed with a second crown which is fixed with respect to said longitudinal axis.
- the reducer according to the invention may comprise one or more of the following characteristics, taken in isolation from one another, or in combination with one another:
- the housing is mounted in a sealed manner on the solar or a shaft secured to the solar or coupled to this solar,
- the casing is fixed to said fixed crown, and in particular the flange of the casing is fixed to a flange of the fixed crown,
- the housing is fixed directly to a stator
- the casing is mounted in a sealed manner on a portion integral in rotation with said movable crown,
- the casing is mounted in a sealed manner on a portion integral in rotation with the planet carrier.
- the invention further relates to a turbomachine or a system for driving a landing gear wheel, in particular an aircraft wheel, comprising at least one casing or mechanical reducer as described above.
- Figure 1 is a schematic axial sectional view of an aircraft turbomachine
- FIG. 2 Figure 2 is a partial schematic view in axial section of a planetary mechanical reducer with oil jets
- Figure 3 is a partial schematic view in axial section of a planetary mechanical splash reducer
- Figure 4 is a partial schematic view in axial section of a Wolfrom mechanical splash reducer
- Figure 5 is another partial schematic in perspective and in axial section of a reducer comprising a fixed casing according to an embodiment of the invention
- Figure 6 is a schematic perspective view of the housing of Figure 5
- Figure 7 is a view similar to that of Figure 6 and illustrates the housing during operation of the reducer
- Figure 8 is a partial schematic view of an alternative embodiment of a housing according to the invention.
- Figure 9 is a schematic perspective view of a wheel of an aircraft landing gear and a drive system for this wheel.
- Figure 1 describes a turbomachine 1 which comprises, in a conventional manner, a fan S, a low-pressure compressor 1a, a high-pressure compressor 1b, an annular combustion chamber 1c, a high-pressure turbine 1d, a low-pressure turbine 1e and an exhaust nozzle 1h.
- the high-pressure compressor 1b and the high-pressure turbine 1d are connected by a high-pressure shaft 2 and form with it a high-pressure (HP) body.
- HP high-pressure
- the low-pressure compressor 1a and the low-pressure turbine 1e are connected by a low-pressure shaft 3 and form with it a low-pressure (LP) body.
- the blower S is driven by a blower shaft 4 which is rotated with the LP shaft 3 by means of a reducer 6.
- This reducer 6 can be of the planetary, epicyclic or Wolfrom type for example.
- the reducer 6 is positioned in the upstream part of the turbomachine.
- a fixed structure schematically comprising, here, an upstream part 5a and a downstream part 5b which composes the motor casing or stator 5 is arranged so as to form an enclosure E surrounding the reducer 6.
- This enclosure E is here closed upstream by seals at the level of a bearing allowing the fan shaft 4 to pass through, and downstream by seals at the level of the crossing of the LP shaft 3.
- FIG. 2 shows a reducer 6 that can take the form of different architectures depending on whether certain parts are fixed or rotating.
- the reducer 6 is connected to the BP shaft 3, for example via internal splines 7a.
- the BP shaft 3 drives a planetary pinion called the sun gear 7.
- the sun gear 7, whose axis of rotation coincides with that of the turbomachine X drives a series of pinions called satellites 8, which are distributed over the same diameter around the axis of rotation X. This diameter is equal to twice the operating center distance between the sun gear 7 and the satellites 8.
- the number of satellites 8 is generally defined between three and seven for this type of application.
- the set of satellites 8 is held by a satellite carrier 10. Each satellite 8 rotates around its own Y axis, and meshes with the crown 9.
- the set of satellites 8 rotates the planet carrier 10 around the axis X of the turbomachine.
- the crown is fixed to the engine casing or stator 5 via a crown carrier 12 and the planet carrier 10 is fixed to the fan shaft 4.
- ⁇ in a planetary configuration all of the satellites 8 are held by a planet carrier 10 which is fixed to the engine casing or stator 5.
- Each satellite drives the crown which is attached to the fan shaft 4 via a crown carrier 12.
- Each satellite 8 is mounted to rotate freely using a bearing 11, for example of the rolling bearing or hydrodynamic plain bearing type.
- the bearing 11 comprises a bearing body 10b and the bearing bodies 10b of the different plain bearings are positioned relative to each other and are carried by walls 10a1, 10a2 of the satellite carrier 10.
- the walls 10a1, 10a2 have an annular shape and are perpendicular to the axis X. They are axially spaced from each other and receive between them the bearings 11, the satellites 8 and the solar 7.
- bearings 11 There are a number of bearings 11 equal to the number of satellites 8. For reasons of operation, assembly, manufacturing, control, repair or replacement, the bearings 11 (and in particular the bearing bodies 10b) and the walls 10a1, 10a2 can be separated into several parts.
- the 8d toothing of a reducer can be separated into several helices each having a median plane P.
- an upstream half-crown 9a consisting of a rim 9aa and a half-fixing flange 9ab.
- On the rim 9aa is the upstream helix of the gear teeth. This upstream helix meshes with that of the satellite 8 which meshes with that of the solar 7.
- a downstream half-crown 9b consisting of a rim 9ba and a half-fixing flange 9bb.
- On the rim 9ba is the downstream helix of the gear teeth. This downstream helix meshes with that of the satellite 8 which meshes with that of the solar 7.
- the half-clamp 9ab of the upstream crown 9a and the half-clamp 9bb of the downstream crown 9b form the fixing flange 9c of the crown.
- the crown 9 is fixed to a crown carrier by assembling the fixing flange 9c of the crown and the fixing flange 12a of the crown carrier using a bolted assembly for example.
- the flange 9c of the crown 9 could be replaced by grooves.
- the arrows in Figure 2 describe the routing of the oil in the reducer 6.
- the oil arrives in the reducer 6 from the stator part 5 in the distributor 13 by different means which will not be specified in this view because they are specific to one or more types of architecture.
- the distributor is separated into two parts, each generally repeated by the same number of satellites.
- the injectors 13a have the function of lubricating the teeth and the arms 13b have the function of lubricating the bearings 11.
- the oil is brought to injectors 13a to exit through ends 13c in order to lubricate the teeth of the satellites 8, the solar 7 and also the crown 9 with oil.
- the oil is also brought to the arm 13b and circulates via the supply mouth 13d of the bearing body 10b in an internal cavity 10c of the latter. The oil then circulates in this cavity 10c to supply oil passage orifices 10d to an external cylindrical surface guiding the corresponding satellite.
- the reducer 6 in Figure 2 is thus a reducer of the type with oil jets or injectors.
- the present invention relates to a splash type reducer, two examples of which are illustrated in Figures 3 and 4.
- the reducer 106 is a splash planetary reducer, that is to say that its ring gear 109 is movable and its planet carrier 110 is fixed. As seen in this figure, the reducer 106 is enclosed in a sealed enclosure Q.
- the enclosure Q may be formed by one or more annular casings 120, 122 assembled together. The sealing is ensured by seals 124 or the like which are for example located:
- the oil H1 contained in the enclosure Q is located in the lower part of the reducer 106 and in particular of the enclosure Q. A part of the crown 109, the satellites 108 and the planet carrier 110 bathe or splash in this oil. During operation, a ring of oil H2 forms inside the enclosure Q, all around the axis X.
- the reducer 206 is a Wolfrom splash reducer, that is, it comprises two crowns 209a, 209b, namely a movable crown 209a and a fixed crown 209b. As seen in this figure, the reducer 206 is also enclosed in a sealed enclosure Q.
- the satellites 208 are double-stage and comprise a first stage 208a meshed with the first crown 209a and the sun 207, and a second stage 208b meshed with a second crown 209b which is fixed with respect to said longitudinal axis X.
- the enclosure Q may be formed by one or more annular casings 220, 222 assembled together.
- the fixed crown 209b is here fixed to the casing(s) 220, 222 of the enclosure Q, and in particular interposed between two casings 220, 222 of the enclosure Q.
- annular seals 225 or similar which are for example located:
- the rotating mobile elements are guided by rolling bearings 224 which are for example located:
- the oil H1 When stationary, the oil H1 is located in the lower part of the reducer 206 and in particular of the enclosure Q. A part of the crowns 209a, 209b, of the satellites 208 and of the satellite carrier 210 bathe or splash in this oil. During operation, a ring of oil H2 forms inside the enclosure Q, all around the axis X.
- the present invention relates to a fixed casing 122, 222 for a mechanical reducer 106, 206 of an aircraft.
- the reducer 106, 206 may be of the planetary, epicyclic, differential or Wolfrom type.
- this reducer 106, 206 may be used in a turbomachine 1 such as that illustrated in FIG. 1, for driving a fan S, or in another context such as in a system for driving a wheel for an aircraft landing gear (see FIG. 9).
- Figures 5 to 7 illustrate a first embodiment of a casing 122, 222 according to the invention
- Figure 8 illustrates an alternative embodiment of this casing.
- the casing 122, 222 is preferably metallic. Its main material is therefore a metal alloy.
- the casing 122, 222 at least partially delimits the enclosure Q which surrounds and encloses the remainder of the reducer, this enclosure Q being sealed and containing oil for splashing the reducer.
- this enclosure Q are located the solar 107, 207, the satellites 108, 208, the crown(s) 109, 209a, 209b according to the configuration of the reducer 106, 206, and the planet carrier 110, 210 (not visible in Figure 5), as mentioned above.
- the housing 122, 222 has an annular shape around the X axis and comprises:
- cylindrical wall 230 extending around the axis X and connected to an annular fixing flange 232, this cylindrical wall 230 comprising a first internal cylindrical surface 230a, and
- annular wall 234 extending around the axis X and having its external periphery connected to the cylindrical wall 230, this annular wall 234 comprising a second annular surface 234a connected to the first surface 230a.
- the flange 232 of the housing 122, 222 is fixed to a flange of the fixed crown 209b and could be fixed to a flange of another housing of the enclosure, such as the housing 120 of FIG. 3.
- the first and second surfaces 230a, 234a define an annular space E configured to receive the aforementioned oil ring H2.
- the casing 122, 222 has a general L-shaped section, its annular wall 234 being a radial wall.
- the wall 234 could be a truncated cone-shaped wall.
- housing 122, 222 could be mounted on other elements of the reducer in a sealed manner by means of seals (see figures 3 and 4).
- the housing 122, 222 comprises at least one oil deflector 240 projecting on at least one of the first and second surfaces 230a, 234a.
- the housing 122, 222 includes a single baffle 240 which is located substantially on the first surface 230a. However, it is noted that the baffle 240 is connected to the second surface 234a.
- the deflector 240 is located at 12 o'clock by analogy with the dial of a clock when the casing 122, 222 is in the position of use in which its longitudinal axis X is horizontal.
- the deflector 240 has a generally elongated shape, in particular along the longitudinal axis X. In the examples shown, it extends axially from the second surface 234a to the flange 232.
- the or each deflector 240 may have a generally triangular cross-sectional shape, as illustrated in FIGS. 5 to 7
- the deflector 240 may comprise a first side 240a oriented in a circumferential direction, which has a concave curved shape, and optionally a second side 240b oriented in an opposite circumferential direction, which has a concave curved shape (FIG. 6).
- the sides 240a, 240b of the or each deflector 240 may have identical or, on the contrary, different curved shapes, and in particular curved shapes having different radii of curvature. These radii of curvature may be chosen according to the direction of rotation of the oil in the ring H2.
- the deflector 240 may have an arrowhead shape with a base 240c connected to the second surface 234a and the tip 240d located on the side of the flange 232, as illustrated in the alternative embodiment of FIG. 8.
- the deflector 240 may comprise:
- the surfaces 240e, 240f could form an angle a between them of less than 90°, or even go as far as 0°. In the latter case, these surfaces would be parallel.
- an oil ring H2 forms in the reducer 106, 206 and in particular in the enclosure Q, between the surfaces 230a, 234a.
- the oil is rotated by the crown 109 or the movable crown 209a (arrow F1).
- This rotating oil reaches the deflector 240 which modifies its trajectory and detaches it from the surface 230a, or even from the surface 234a.
- the oil is then deflected in a predetermined direction, for example towards gears to be lubricated (arrows F2).
- the gear to be lubricated is for example that between the satellites 108, 208 and the crown(s) 109, 209a, 209b.
- baffle 240 located at the top of the housing 122, 222, it is possible to position it anywhere around the housing 122, 222, as needed. It is also possible to add multiple instances of these baffles 240.
- Figure 9 shows a system 310 for driving at least one wheel 312 of an aircraft landing gear 314.
- the wheel 312 comprises a rim 316 which has an axis of rotation X.
- this rim 316 has a generally tubular or disc shape and carries a tire 318 at its periphery.
- the system 310 comprises an electric motor 320 and a mechanical transmission system 322 between a shaft of the motor 320 and the rim 316 of the wheel 312.
- the motor 320 and the system 322 each have a generally annular shape and are centered on the X axis. They are arranged next to each other and the system 322 is installed between the motor 320 and the rim 316. A portion of the system 322, or even also a portion of the motor 320, could be housed in the rim 16 to reduce the size of the system 310.
- the motor 320 and the system 322 can be protected by an external cylindrical cover 326 projecting on one side of the rim 316 or the tire 318.
- the mechanical transmission system 322 comprises a mechanical reducer 328 similar to the reducer 106, 206 described above and including a casing 122, 222 within the meaning of the invention.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Details Of Gearings (AREA)
- Retarders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2303450A FR3147613B1 (fr) | 2023-04-06 | 2023-04-06 | Carter fixe pour un reducteur mecanique d’aeronef |
| PCT/FR2024/050438 WO2024209160A1 (fr) | 2023-04-06 | 2024-04-04 | Carter fixe pour un reducteur mecanique d'aeronef |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4689446A1 true EP4689446A1 (fr) | 2026-02-11 |
Family
ID=87036698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24722676.4A Pending EP4689446A1 (fr) | 2023-04-06 | 2024-04-04 | Carter fixe pour un reducteur mecanique d'aeronef |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4689446A1 (fr) |
| CN (1) | CN120981677A (fr) |
| FR (1) | FR3147613B1 (fr) |
| WO (1) | WO2024209160A1 (fr) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6334343A (ja) * | 1986-07-28 | 1988-02-15 | Toshiba Corp | 差動遊星歯車装置 |
| JP6178344B2 (ja) * | 2012-02-23 | 2017-08-09 | サフラン・エアクラフト・エンジンズ | 減速歯車装置、ファンモジュールおよびバイパスターボジェットエンジン |
| FR3025780B1 (fr) | 2014-09-15 | 2018-01-12 | Safran Transmission Systems | Train de roulage |
| FR3066792B1 (fr) | 2017-05-23 | 2019-07-26 | Safran Transmission Systems | Dispositif de lubrification de palier |
| FR3071023B1 (fr) | 2017-09-12 | 2021-02-19 | Safran Trans Systems | Pivot pour palier lisse |
| FR3072749B1 (fr) | 2017-10-24 | 2020-01-03 | Safran Transmission Systems | Train d'engrenages epicycloidal |
| AU2019201928B2 (en) * | 2018-03-23 | 2020-10-22 | Wheeltug plc | Epicyclic gearbox |
| FR3098562B1 (fr) | 2019-07-08 | 2021-06-11 | Safran Trans Systems | Couvercle de canalisation d’huile et reducteur mecanique de turbomachine d’aeronef comportant un tel couvercle |
| FR3101129B1 (fr) | 2019-09-24 | 2021-08-27 | Safran Trans Systems | Restricteur d’huile pour la lubrification de secours d’un element de turbomachine d’aeronef |
| FR3108308B1 (fr) | 2020-03-19 | 2024-01-19 | Safran Trans Systems | Dispositif d’entrainement d’au moins une roue d’un train d’atterrissage d’aeronef |
-
2023
- 2023-04-06 FR FR2303450A patent/FR3147613B1/fr active Active
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2024
- 2024-04-04 EP EP24722676.4A patent/EP4689446A1/fr active Pending
- 2024-04-04 CN CN202480024164.XA patent/CN120981677A/zh active Pending
- 2024-04-04 WO PCT/FR2024/050438 patent/WO2024209160A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3147613A1 (fr) | 2024-10-11 |
| FR3147613B1 (fr) | 2026-01-23 |
| CN120981677A (zh) | 2025-11-18 |
| WO2024209160A1 (fr) | 2024-10-10 |
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