IMPELLER OF A LUBRICATION SYSTEM FOR A REDUCER OF AN AIRCRAFT TURBOMACHINE

Abstract

Impeller (31) of a lubrication system (30) for a reducer (17) of an aircraft turbomachine, the impeller (31) comprising an oil distribution gutter (36) and an oil stabilizing gutter (37) which is axially attached to the distribution gutter (36), the stabilizing gutter (37) being the only one of the two gutters (36, 37) configured to receive the oil supplied by a fixed injector (32) of the lubrication system (30), the gutters (36, 37) having a common radial wall (38) which delimits them from one another by extending radially with respect to an axis (X), the distribution gutter (36) being supplied with oil by overflow from the stabilizing gutter (37) via the common wall (38), the distribution gutter (36) being the only one of the two gutters (36, 37) to be connected with different lubrication circuits (39a, 39b) which are configured to convey the oil to elements (28, 29) to be lubricated of the reducer (17).Figure for abstract: Figure 2.

Description

Title of the invention: WHEEL OF A LUBRICATION SYSTEM FOR A REDUCER OF A TURBOMACHINE OF AIRCRAFT Technical field of the invention

[0001] The present invention relates to an impeller of a lubrication system for a reducer of an aircraft turbomachine, and to a turbomachine comprising such an impeller. Technical background

[0002] A dual-flow turbomachine conventionally comprises a fan and a gas generator which comprises at least one compressor, a combustion chamber and at least one turbine. The fan generates an air flow which is divided into a primary flow intended to supply the gas generator and into a secondary flow which contributes predominantly to the thrust provided by the turbomachine.

[0003] In the case of a turbomachine with a reduction gear, the fan shaft is driven by a turbine shaft via a speed reducer. The reduction gear makes it possible to reduce the rotational speed of the fan shaft relative to that of the turbine shaft. The reduction gear is conventionally placed in an enclosure (commonly called an “oil enclosure”).

[0004] Such a reducer conventionally comprises at least one sun gear, a crown gear, satellites and a planet carrier. Depending on the requirements, the reducer can be configured in different ways.

[0005] In the remainder of the application, we will be more particularly interested in the configurations in which the planet carrier is mobile, namely in particular the configuration commonly called “epicyclic” and the configuration commonly called “differential”.

[0006] More precisely, an epicyclic reducer has a sun gear fixed in rotation to the turbine shaft, a planet carrier fixed in rotation to the fan shaft and a fixed crown. Unlike the epicyclic reducer, the differential reducer has a mobile crown.

[0007] The bearings and teeth of the toothed wheels of such reducers are abundantly lubricated with oil via a lubrication system, in particular to minimize the wear of the contact surfaces of these different parts, and thus maximize the efficiency and service life of the reducer.

[0008] Document FR3041054A1 in the name of the applicant discloses a lubrication system comprising in particular a wheel (also called a distributor centrifugal) secured to the mobile planet carrier and the injectors secured to the fixed structure of the turbomachine.

[0009] More specifically, the impeller comprises an oil receiving and distribution gutter which is not only intended to receive the oil delivered by the injectors but also to distribute it to different circuits which are configured to convey the oil to the parts to be lubricated of the reducer.

[0010] Such a gutter is generally internally divided into several pockets, each pocket being connected to one or more circuits.

[0011] The oil received in each of the pockets is rotated under the action of centrifugal force, then conveyed into the circuit(s) associated with it under the action of centrifugal pressure.

[0012] Engine manufacturers note that such a wheel can be improved.

[0013] Indeed, engine manufacturers note the presence of significant splashes resulting from impacts between the injected oil and the oil already present in the gutter. These splashes disrupt the filling of the pockets, to the point of limiting the oil level in each of the pockets, and consequently limiting the quantity of oil conveyed to the parts to be lubricated.

[0014] Furthermore, feeding the gutter by a determined number of injectors inevitably involves a discontinuous feeding of each pocket. The centrifugal pressure of the oil in each of the pockets thus decreases progressively after it has been filled by an injector, and this until the next filling. Such a variation in the centrifugal pressure involves a variation in the oil flow rate in each of the circuits, and consequently a variable lubrication of the parts to be lubricated.

[0015] The objective of the present invention is therefore to provide a simple, effective and economical solution making it possible to respond at least in part to the aforementioned problems.

[0016] Document FR3047279A1 in the name of the applicant describes a spinning wheel with two receiving and distribution gutters. Summary of the invention

[0017] The invention thus proposes a wheel of a lubrication system for a reducer of an aircraft turbomachine, the wheel being intended to be integral in rotation with a mobile planet carrier of the reducer, the wheel extending around an axis X and comprising an oil distribution gutter which is annular around the axis X and open towards the axis X; characterized in that the impeller comprises an oil stabilizing gutter which is axially attached to the distribution gutter, the stabilizing gutter being annular around the X axis and open towards the X axis, the stabilizing gutter being the only one of the two gutters configured to receive the oil supplied by at least one fixed injector of the lubrication system, the gutters having a common radial wall which delimits them from one another by extending radially with respect to the X axis, the distribution gutter being supplied with oil by overflow from the stabilizing gutter via the common wall, the distribution gutter being the only one of the two gutters to be connected with different lubrication circuits which are configured to convey the oil to elements to be lubricated of the reducer.

[0018] The separation of oil reception and oil distribution via the introduction of a stabilizing gutter offers numerous advantages.

[0019] The supply of the distribution gutter is now obtained by the overflow of the stabilization gutter.

[0020] Such a supply is not subject to splashing, which makes it possible to maximize the oil level in the distribution gutter, and consequently to maximize the quantity of oil conveyed to the elements to be lubricated of the reducer, to the benefit in particular of the efficiency and the service life of the reducer.

[0021] Furthermore, such a supply is continuous, which makes it possible to have a centrifugal pressure of the oil which is constant over time, as is the flow rate in each of the circuits and the lubrication of the elements to be lubricated, to the benefit in particular of the efficiency and the service life of the reducer.

[0022] The spinning wheel according to the invention may comprise one or more of the following characteristics and / or steps, taken in isolation from one another or in combination with one another: - the stabilizing gutter is axially delimited by the common wall and a first axial end wall which are arranged axially opposite each other, a radially internal free end of the first axial end wall being arranged closer to the X axis than a radially internal free end of the common wall; - the distribution gutter is axially delimited by the common wall and a second axial end wall which are arranged axially opposite each other, a radially internal free end of the second axial end wall being arranged at the same distance or closer to the X axis than a radially internal free end of the common wall; - the stabilizing gutter is axially delimited by the common wall and a first axial end wall which are arranged axially opposite each other and connected to each other by a first bottom wall, the distribution gutter being axially delimited by the common wall and a second axial end wall which are arranged axially opposite each other and connected to each other by a second bottom wall, the first bottom wall having a radial dimension which is less than the radial dimension of the second bottom wall, the first and second bottom walls being arranged axially on either side with respect to the common wall; - the stabilization gutter comprises at least one device for trapping impurities present in the oil; - the stabilizing gutter comprises a balancing device which is configured to balance the spinning wheel about the X axis; - the trapping device and the balancing device are combined into a single device; -the trapping device comprises blind holes formed in a first bottom wall of the stabilizing gutter and / or magnetic elements intended to retain ferromagnetic impurities present in the oil; - the balancing device comprises at least one addition of projecting material and / or at least one removal of material forming a hollow.

[0023] The present invention also relates to an aircraft turbomachine comprising a reduction gear which comprises a mobile planet carrier and an impeller as described previously, the impeller being integral in rotation with the planet carrier. Brief description of the figures

[0024] The invention will be better understood and other details, characteristics and advantages of the invention will appear more clearly on reading the following description given by way of non-limiting example and with reference to the appended drawings in which:

[0025] [Fig-1] [Fig.l] is a schematic view in axial half-section of a turbomachine with reducer according to the invention;

[0026] [Fig.2] [Fig.2] is a detailed view of the reducer of [Fig.l];

[0027] [Fig.3] [Fig.3] is a detailed and cutaway view of the reducer of figures 1 and 2;

[0028] [Fig.4] [Fig.4] is a detailed and half-sectional axial view which illustrates a first variant of the construction of a spinning wheel;

[0029] [Fig.5] [Fig.5] is a detailed view in radial section which illustrates a second variant embodiment of a spinning wheel, according to a plane passing through a stabilizing gutter of the spinning wheel. Detailed description of the invention

[0030] In [Fig.l] a turbomachine 1 of an aircraft 2 is partially represented. Aircraft 2 is for example an airplane.

[0031] By convention in the present application, the terms “upstream” and “downstream” are defined in relation to the direction of circulation of the gases in the turbomachine 1, when the turbomachine 1 operates in “propulsor” mode.

[0032] As illustrated in [Fig.l], the turbomachine 1 conventionally comprises from upstream to downstream, a ducted fan 3, a low pressure compressor 4, a high pressure compressor 5, an annular combustion chamber 6, a high pressure turbine 7, a low pressure turbine 8 and an exhaust nozzle 9.

[0033] The high-pressure compressor 5 and the high-pressure turbine 7 are connected to each other by a high-pressure shaft 11 and form with it a high-pressure (HP) body. The low-pressure compressor 4 and the low-pressure turbine 8 are connected to each other by a low-pressure shaft 12 and form with it a low-pressure (LP) body.

[0034] As illustrated in [Fig.l], the air flow generated by the fan 3 is divided, by a fixed structure 13 of the turbomachine 1, into a primary flow which enters a primary vein 14 to supply the low pressure compressor 4, and into a secondary flow which flows in a secondary vein 15 around the gas generator, to provide the majority of the thrust.

[0035] As illustrated in [Fig.l], the blower 3 is driven in rotation by a blower shaft 16 which is itself driven in rotation by the low pressure shaft 12 by means of a speed reducer 17.

[0036] The turbomachine 1 extends along a longitudinal axis X which corresponds in particular to the axis of rotation of the fan shaft 16, of the high pressure shaft 11 and of the low pressure shaft 12.

[0037] As indicated above, the reducer 17 is here of the “epicyclic” or “differential” type, and hereinafter called reducer 17. The reducer 17 makes it possible to reduce the rotation speed of the fan shaft 16 relative to that of the low pressure shaft 12.

[0038] The reducer 17 comprises a central sun gear 18 secured to the low pressure shaft 12 and a planet carrier 19 secured to the fan shaft 16, the sun gear 18 and the planet carrier 19 being movable around the axis X. The reducer 17 also comprises a fixed ring gear 20 (for an “epicyclic” type reducer) or a movable ring gear 20 (for a “differential” type reducer). The planet carrier 19 carries several planet gears 21 distributed around the axis X, each planet gear 21 being meshed with both the sun gear 18 and the ring gear 20.

[0039] As illustrated in [Fig.l], the reducer 17 is housed and lubricated in an annular enclosure 22 around the axis X, the enclosure 22 being positioned in the upstream part of the turbomachine 1. The enclosure 22 is here formed by an upstream shell 23 and a downstream shell 24 of the fixed structure 13. The enclosure 22 is here closed upstream by seals at the level of a bearing allowing the fan shaft 16 to pass through, and downstream by seals at the level of the passage of the low pressure shaft 12.

[0040] As illustrated in Figures 2 and 3, the low pressure shaft 12 is rotationally connected to the solar 18 via splines 25. The fan shaft 16 is rotationally connected to the planet carrier 19 via a series of fingers 26 distributed around the X axis. Each satellite 21 is carried by an axis 27 which is integral with the planet carrier 19 and guided in rotation by a bearing 28 arranged between the axis 27 and the satellite 21. The bearing 28 is for example a plain bearing, a rolling bearing or even a hydrodynamic bearing. The crown 20 comprises two half-crowns 20a, 20b flanged to each other. The reducer 17 is here single-stage but it could be double-stage. The different toothed wheels of the reducer 17 here have a herringbone toothing 29 but they could have for example a straight toothing or a helical toothing.

[0041] The reducer 17 is lubricated via a lubrication system 30. The lubrication system 30 comprises a movable impeller 31 and several fixed injectors 32. In other words, the impeller 31 is placed in a rotating frame of reference of the turbomachine 1, and the injectors 32 are placed in a fixed frame of reference of the turbomachine 1. The impeller 31 is integral in rotation with the mobile planet carrier 19 of the reducer 17. The injectors 32 are integral with the fixed structure 13 of the turbomachine 1. The injectors 32 are supplied with oil by means of one or more pumps connected to an oil reservoir of the turbomachine 1. One or more pipes 33 make it possible to convey the pressurized oil from the pump to an injector 32, the pipe(s) 33 being here associated with a buffer tank 34. Each injector 32 comprises one or more nozzles 35 which inject the oil in the form of a jet towards the impeller 31.The impeller 31 extends about the X-axis, and includes an oil distribution gutter 36 which is annular about the X-axis and open toward the X-axis.

[0042] According to the invention, the impeller 31 also comprises an oil stabilizing gutter 37 which is axially attached to the distribution gutter 36. The stabilizing gutter 37 is annular around the axis X and open towards the axis X. The stabilizing gutter 37 is the only one of the two gutters 36, 37 configured to receive the oil supplied by the fixed injectors 32 of the lubrication system 30. The gutters 36, 37 have a common radial wall 38 which delimits them from one another by extending radially with respect to the axis X. The distribution gutter 36 is supplied with oil by overflow from the stabilizing gutter 37 via the common wall 38. The distribution gutter 36 is the only one of the two gutters 36, 37 to be connected with different circuits lubrication 39a, 39b which are configured to convey the oil to elements to be lubricated (bearings 28, teeth 29 at the meshing zones, etc.) of the reducer 17.

[0043] The separation of oil reception and oil distribution via the introduction of a stabilizing gutter offers numerous advantages.

[0044] The supply of the distribution gutter is now obtained by the overflow of the stabilization gutter.

[0045] Such a feed is not subject to splashing, which makes it possible to maximize the oil level in the distribution gutter, and consequently to maximize the quantity of oil delivered to the reducer's elements to be lubricated, particularly to the benefit of the reducer's efficiency and service life.

[0046] Furthermore, such a supply is continuous, which makes it possible to have a centrifugal pressure of the oil which is constant over time, as is the flow rate in each of the circuits and the lubrication of the elements to be lubricated, to the benefit in particular of the efficiency and the service life of the reducer.

[0047] The wheel 31 is also defined along the X axis which corresponds in particular to its axis of rotation.

[0048] By convention in the present application, the radial dimensions explained in this application have as reference the axis X of the wheel 31.

[0049] Furthermore, by convention in the present application, “axial” or “axially” means any direction parallel to the axis X of the turbomachine 1 or the impeller 31, “radial” or “radially” means any direction perpendicular to the axis X of the turbomachine 1 or the impeller 31, and “tangent” or “tangentially” means any direction relative to the circumference of the turbomachine 1 or the impeller 31 (as opposed to the axial and radial directions explained above).

[0050] Finally, by convention in the present application, the terms “internal” and “external” are defined radially relative to the axis X of the turbomachine 1 or the impeller 31.

[0051] Advantageously, the stabilizing gutter 37 is delimited axially by the common wall 38 and a first axial end wall 40 which are arranged axially opposite one another. A radially internal free end of the first axial end wall 40 is arranged closer to the axis X than a radially internal free end of the common wall 38.

[0052] Advantageously, the radial height of the common wall 38 is less than the radial height of the first axial end wall 40. The difference in height between the first axial end wall 40 and the common wall 38 is preferably greater than or equal to 1.5 mm.

[0053] Advantageously, the distribution gutter 36 is axially delimited by the common wall 38 and a second axial end wall 41 which are arranged axially opposite one another. A radially internal free end of the second axial end wall 41 is arranged at the same distance or closer to the axis X than a radially internal free end of the common wall 38.

[0054] Advantageously, the common wall 38 and the first wall 40 are connected to each other by a first bottom wall 43, and the common wall 38 and the second wall 41 are connected to each other by a second bottom wall 44. The first bottom wall 43 has a radial dimension which is less than the radial dimension of the second bottom wall 44. The first and second bottom walls 43, 44 are arranged axially on either side with respect to the common wall 38. Such a dimen sioning makes it possible to form a location on the external periphery of the stabilizing gutter 37, this location being capable of accommodating for example a balancing device 45.

[0055] The radial height of the common wall 38 defines the depth of the stabilizing gutter 37. Advantageously, the radial height of the common wall 38 is greater than or equal to 15 mm.

[0056] The stabilizing gutter 37 may be non-compartmentalized (or undivided), and thus internally comprise a single annular chamber 46 which extends continuously around the X axis.

[0057] The stabilizing gutter 37 may be internally compartmentalized (or divided) into several compartments via low walls, the compartments being arranged next to each other around the X axis. Each low wall connects together the common wall 38, the first axial end wall 40 and the first bottom wall 43. Each low wall may have a radial height of between 10% and 95% of the radial height of the compartment which is defined by the common wall 38.

[0058] The compartments may have identical or distinct dimensional characteristics.

[0059] By way of example, the stabilizing gutter 37 may comprise first compartments which each extend tangentially over a first angular range and second compartments which each extend tangentially over a second angular range, the first compartments being interposed between the second compartments.

[0060] Advantageously, the stabilizing gutter 37 has an axial width which is greater than the axial width of the jets delivered by the injectors 32.

[0061] Advantageously, the distribution gutter 36 is partitioned (or divided) internally into several pockets 47a, 47b via partitions 48, the pockets 47a, 47b being arranged next to each other around the axis X. Each partition 48 connects together the second axial end wall 41, the common wall 38 and the second bottom wall 44. Each pocket 47a, 47b is connected to one or more lubrication circuits 39a, 39b.

[0062] The pockets 47a, 47b may have identical or distinct dimensional characteristics.

[0063] By way of example, the distribution gutter 36 may comprise first pockets 47a which each extend tangentially over a first angular range and second pockets 47b which each extend tangentially over a second angular range, the first pockets 47a being interposed between the second pockets 47b.

[0064] Advantageously, the stabilizing gutter 37 is formed in one piece with the distribution gutter 36.

[0065] Advantageously, the stabilizing gutter 37 comprises at least one device 49 for trapping impurities present in the oil.

[0066] The impurities are generally in the form of particles of matter. The metal particles (commonly called “filings”) are harmful to the reducer 17, which is why it is advantageous to trap them before they reach the elements to be lubricated of the reducer 17.

[0067] The trapping device 49 may comprise blind holes 50 formed in the first bottom wall 43 of the stabilizing gutter 37. The metal particles are denser than the oil, so under the action of centrifugal force the particles move towards the place or places where the centrifugal pressure is maximum, namely the bottom of the holes 50.

[0068] Preferably, each hole 50 is oriented according to radial and tangential components, to limit the fall by gravity of the trapped particles, when the impeller 31 rotates at low speed or is stationary.

[0069] The trapping device 49 may comprise an annular row of blind holes 50 around the X axis.

[0070] The trapping device 49 may also comprise magnetic elements (commonly called “magnets”) intended to retain ferromagnetic impurities present in the oil. The magnetic elements are arranged internally on the common wall 38 and / or the first axial end wall 40 and / or the first bottom wall 43.

[0071] Advantageously, the stabilizing gutter 37 comprises a balancing device 45 which is configured to balance the spinning wheel 31 in rotation around the X axis. More precisely, the balancing device 45 aims in particular to place the center of gravity of the spinning wheel 31 on its axis of rotation, namely the X axis.

[0072] Preferably, the balancing device 45 comprises at least one addition of material and / or at least one removal (or removal) of material.

[0073] The addition(s) of material are added to the stabilizing gutter 37. The addition(s) of material are intended to compensate for the imbalance; they are generally added opposite the imbalance. An addition of material is, for example, in the form of a weight. An addition of material is thus protruding.

[0074] The material withdrawal(s) are formed in the stabilizing gutter 37. The material withdrawal(s) are intended to eliminate the imbalance, and are thus generally formed at the level of the imbalance. A material withdrawal is, for example, in the form of a hole or a hollow.

[0075] The balancing device 45 can be arranged inside and / or outside the stabilizing gutter 37, depending on the space and rea- constraints. lization.

[0076] The trapping device 49 and the balancing device 45 may be grouped (or combined) into a single device. Thus, in such a case, the different elements (for example blind holes and / or magnetic elements) of the trapping device 49 are used to balance the impeller 31.

[0077] For example, the balancing of the wheel 31 is achieved by adjusting the number, position and dimensions of the blind holes 50 of the trapping device 49.

[0078] A lubrication circuit 39a, 39b may comprise a pipe provided with one or more nozzles which open at the level of the different elements to be lubricated (bearings 28, teeth 29 at the level of the meshing zones, etc.) of the reducer 17, the pipe being supplied by the or one of the pockets 47a, 47b of the distribution gutter 36.

[0079] In Figures 2 and 4, the path of the oil is symbolized by arrows.

[0080] As illustrated in the figures, the stabilizing gutter 37 is located axially in downstream of the distribution gutter 36. The oil thus flows by overflow from downstream to upstream, via the common wall 38, from the stabilizing gutter 37 to the distribution gutter 36. The jet from each of the injectors 32 is directed only in the direction of the stabilizing gutter 37 (see figures 2 and 4).

[0081] As illustrated in the figures, the stabilizing gutter 37 has a generally U-shaped cross-section. Thus, the common wall 38 and the first axial end wall 40 each have a straight and radial profile in cross-section while the first bottom wall 43 has a straight and axial profile in cross-section. The walls 38, 40, 43 of the stabilizing gutter 37 are solid, and in other words they are not connected to lubrication circuits. The stabilizing gutter 37 is here not compartmentalized (or not divided), and thus internally comprises a single annular chamber 46 which extends continuously around the axis X.

[0082] As illustrated in the figures, the distribution gutter 36 has a generally U-shaped cross-section. Thus, the common wall 38 and the second wall 41 each have a straight and radial profile in cross-section while the second bottom wall 44 has a straight and axial profile in cross-section. The depth of the distribution gutter 36 is greater than that of the stabilizing gutter 37. The width of the distribution gutter 36 is greater than that of the stabilizing gutter 37.

[0083] The distribution gutter 36 is partitioned (or divided) internally into several pockets 47a, 47b via partitions 48, the pockets 47a, 47b being arranged next to each other around the axis X. Each partition 48 connects together the second axial end wall 41, the common wall 38 and the second bottom wall 44. The distribution gutter 36 here comprises first pockets 47a which extend each circumferentially (or tangentially) over a first angular range and second pockets 47b which each extend circumferentially (or tangentially) over a second angular range, the first pockets 47a being interposed between the second pockets 47b.

[0084] The first pockets 47a are each connected to a first lubrication circuit 39a which is configured to convey the oil to the bearing 28 of a satellite 21. The second pockets 47b are each connected to a second lubrication circuit 39b which is configured to convey the oil to the teeth 29 of the toothed wheels (in particular at the meshing zones).

[0085] According to the first embodiment illustrated in [Fig.4], the stabilizing gutter 37 further comprises a balancing device 45 on its external periphery.

[0086] According to the second embodiment variant illustrated in [Fig.5], the stabilizing gutter 37 comprises a trapping device 49 comprising an annular row of blind holes 50 formed in the first bottom wall 43. The blind holes 50 are here distributed regularly around the axis X. Each blind hole 50 is oriented according to radial and tangential components, to limit the fall by gravity of the trapped particles, when the impeller 31 rotates at low speed or is stationary.

Claims

Claims

1. Impeller (31) of a lubrication system (30) for a reducer (17) of a turbomachine (1) of an aircraft (2), the impeller (31) being intended to be integral in rotation with a mobile planet carrier (19) of the reducer (17), the impeller (31) extending around an axis (X) and comprising an oil distribution gutter (36) which is annular around the axis (X) and open towards the axis (X);characterized in that the impeller (31) comprises an oil stabilizing gutter (37) which is axially attached to the distribution gutter (36), the stabilizing gutter (37) being annular around the axis (X) and open towards the axis (X), the stabilizing gutter (37) being the only one of the two gutters (36, 37) configured to receive the oil supplied by a fixed injector (32) of the lubrication system (30), the gutters (36, 37) having a common radial wall (38) which delimits them from each other by extending radially with respect to the axis (X), the distribution gutter (36) being supplied with oil by overflow from the stabilizing gutter (37) via the common wall (38), the distribution gutter (36) being the only one of the two gutters (36, 37) to be connected with different lubrication circuits (39a, 39b) which are configured to convey the oil to elements (28, 29) to be lubricated of the reducer (17).;

2. Spinning wheel (31) according to claim 1, characterized in that the stabilizing gutter (37) is axially delimited by the common wall (38) and a first axial end wall (40) which are arranged axially opposite each other, a radially internal free end of the first axial end wall (40) being arranged closer to the axis (X) than a radially internal free end of the common wall (38).

3. Impeller (31) according to one of the preceding claims, characterized in that the distribution gutter (36) is axially delimited by the common wall (38) and by a second axial end wall (41) which are arranged axially opposite one another, and in which a radially internal free end of the second axial end wall (41) is arranged at the same distance or closer to the axis (X) than a radially internal free end of the common wall (38).

4. Spinning wheel (31) according to one of the preceding claims, characterized in that the stabilizing gutter (37) is axially delimited by the common wall (38) and a first axial end wall (40) which are arranged axially opposite each other and connected to each other by a first bottom wall (43), the distribution gutter (36) being axially delimited by the common wall (38) and a second axial end wall (41) which are arranged axially opposite each other and connected to each other by a second bottom wall (44), the first bottom wall (43) having a radial dimension which is less than the radial dimension of the second bottom wall (44), the first and second bottom walls (43, 44) being arranged axially on either side opposite the common wall (38).

5. Spinning wheel (31) according to one of the preceding claims, characterized in that the stabilizing gutter (37) comprises a device for trapping impurities (49) present in the oil.

6. Spinning wheel (31) according to one of the preceding claims, characterized in that the stabilizing gutter (37) comprises a balancing device (45) which is configured to balance the spinning wheel (31) in rotation around the axis (X).

7. Spinning wheel (31) according to claims 5 and 6 taken in combination, characterized in that the trapping device (49) and the balancing device (45) are grouped into a single device.

8. Spinning wheel (31) according to claim 5 or 7, characterized in that the trapping device (49) comprises blind holes (50) formed in a first bottom wall (43) of the stabilizing gutter (37) and / or magnetic elements intended to retain ferromagnetic impurities present in the oil.

9. Spinning wheel (31) according to claim 6 or 7, characterized in that the balancing device (45) comprises at least one addition of projecting material and / or at least one removal of material forming a hollow.

10. Turbomachine (1) of aircraft (2) comprising a reduction gear (17) which comprises a mobile planet carrier (19) and an impeller (31) according to one of the preceding claims, the impeller (31) being integral in rotation with the planet carrier (19).

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