Planet carrier for a mechanical gearbox of a turbomachine of an aircraft

Abstract

A planet carrier (113) for a mechanical gearbox (106) of a turbomachine (1), the planet carrier comprising: a one-piece cage (113a) extending around an axis of rotation X, defining an inner casing configured to receive a sun gear (111) and planet gears (116) of the gearbox, and a lubrication system, characterized in that the lubrication system comprises: at least one hole (140) formed in the cage (113a) and extending parallel to the axis X in a range of more than 30% of a maximum axial dimension (L 最大 ) of the cage, and at least two jets (142) for the or each hole (140), the jets being mounted to the cage and each being mounted in a recess (144, 146a, 160) of the cage.

Description

Technical Field

[0001] This invention relates to the field of mechanical gearboxes for turbines, particularly for turbines in aircraft. Background Technology

[0002] Prior art includes, in particular, documents WO-A1-2010 / 092263, FR-A1-2987416, FR-A1-3008462, FR-A1-3008463, FR-A1-3041054, FR-A1-3065773, FR-A1-3073915, FR-A1-3084428, and FR-A1-3092889.

[0003] The function of a mechanical gearbox is to change the speed and torque ratio between the input and output shafts of a mechanical system.

[0004] New-generation dual-flow turbines (especially those with high bypass ratios) include mechanical gearboxes to drive the fan shaft. The typical purpose of the gearbox is to convert the high-speed rotation of the power turbine shaft into a slower rotational speed that drives the fan shaft.

[0005] This gearbox comprises a central pinion called the sun gear, a ring gear, and pinions called planet gears that engage between the sun gear and the ring gear. The planet gears are held in place by a frame called a planet carrier. The sun gear, ring gear, and planet carrier are planet gears because their axes of rotation coincide with the longitudinal axis X of the turbine. Each planet gear has a different axis of rotation, which are evenly distributed around the axis of the planet gear along the same working diameter. These axes are parallel to the longitudinal axis X.

[0006] Several gearbox configurations are available. In the prior art of two-flow turbines, the gearbox is of planetary or planetary type. In other similar applications, there is an architecture referred to as differential or "compound".

[0007] - In a planetary gearbox, the planet carrier is fixed, and the ring gear is the output shaft of the device, which rotates in the opposite direction to the rotation of the sun gear.

[0008] - In the rotary gearbox, the gear ring is fixed, and the planet carrier is the output shaft of the device, which rotates in the same direction as the sun gear.

[0009] - In a compound gearbox, there are no rotating elements. The ring gear rotates in the opposite direction to the sun gear and planet carrier.

[0010] A gearbox can consist of one or more gear stages. This meshing is ensured in different ways, such as through contact, friction, or a magnetic field.

[0011] The gearbox requires an oil supply to lubricate and cool the gears, splines, rollers, and bearings. If the planetary carrier is rotating, oil must be applied to the planetary gear bearings or gears in the rotating field. Therefore, oil needs to be transferred from an oil reservoir located on the stator to the rotating planetary carrier that carries the oil nozzles. This transfer is typically accomplished via an oil transfer bearing (OTB).

[0012] However, once in a rotating environment, the oil is no longer under pressure. At high speeds, due to centrifugal force, it is difficult to reach all areas that require oil lubrication. Therefore, placing the nozzles as close to these areas as possible is crucial. Another issue is the complexity of assembling these nozzles.

[0013] Document CN-B-107781402 proposes a planetary carrier comprising multiple processing channels that supply the nozzles, with their ends sealed with waterproof caps. However, the number of channels and caps is relatively large, and there is a significant risk of damaging the planetary carrier during channel processing, as well as the risk of channel leakage due to improper cap assembly.

[0014] This invention provides improvements to the technology to allow for the resolution of some or all of the problems of the prior art. Summary of the Invention

[0015] This invention relates to a planetary carrier for a mechanical gearbox of a turbine, particularly for aircraft, the planetary carrier comprising:

[0016] - An integral cage extending about a rotation axis X and defining an internal receiving portion configured to receive the sun gear and planetary gears of the gearbox, and

[0017] - A lubrication system, the lubrication system comprising:

[0018] - At least one hole, said hole being formed in the cage and extending parallel to axis X over a range of more than 30% of the maximum axial dimension of the cage, and

[0019] - For the orifice or at least two nozzles for each orifice, the nozzles are mounted on a retainer, and each of these nozzles is mounted in a recess in the retainer, and includes:

[0020] • At least one oil spray nozzle, and

[0021] • An internal channel for fluid communication between the at least one orifice and the orifice.

[0022] The lubrication system is characterized in that, for the hole or each hole, the lubrication system includes at least two nozzles, the at least two nozzles including a longitudinal nozzle that extends in a direction parallel to the axis X and is mounted in a recess that is directly connected to the longitudinal end of the hole.

[0023] Therefore, the present invention provides an improved lubrication system for a gearbox planetary carrier, which essentially comprises an axial bore connected to a plurality of nozzles mounted and connected as close as possible, and preferably directly connected to the axial bore. The axial bore can be simply manufactured by machining the planetary carrier. The bore extends over a large portion of the axial dimension of the carrier; that is, the bore is not, for example, a simple orifice in a wall. Receiving recesses for the nozzles can also be machined. The nozzles are then pressed into these recesses and either retracted or held in place by screws.

[0024] The lubrication system may include a plurality of axial holes distributed around the aforementioned axis. The number of holes is, for example, a function of the number of planetary gears in the gearbox, and is equal to, for example, the number of planetary gears in the gearbox.

[0025] This invention is applicable to oil supply for non-centrifugal rollers, gears, splines, etc. This invention is also suitable for oil supply via OTB.

[0026] The planetary carrier according to the present invention may include one or more of the following features, which may be used individually or in combination with each other:

[0027] - For the hole or each hole, the lubrication system includes at least one transverse nozzle that extends in a direction perpendicular to the axis X and is mounted in a recess directly connected to the hole;

[0028] - The notch for mounting the transverse nozzle is located at the longitudinal end of the hole;

[0029] - The transverse nozzle includes a lateral orifice for fluid communication between the orifice and the channel of the transverse nozzle;

[0030] - A notch for mounting a horizontal nozzle opens into the hole and is spaced apart from the longitudinal end of the hole;

[0031] - At least one of the nozzles is generally tubular in shape and includes a peripheral annular groove for receiving an O-ring seal;

[0032] - At least one of the nozzles includes an outer cylindrical centering surface, which is configured to directly engage with an inner cylindrical surface that is complementary to the cage.

[0033] - At least one of the nozzles includes two or three mutually spaced-apart outer cylindrical centering surfaces;

[0034] - At least one of the nozzles includes an indexing plane and / or an annular collar located on its outer cylindrical surface or one of its outer cylindrical surfaces;

[0035] - At least one of the nozzles includes two or three or more spray orifices, which are aligned front to back and formed in an external boss of the nozzle;

[0036] - At least one of the nozzles includes a single spray orifice that extends directly into an extension of the internal channel of the nozzle;

[0037] -The planetary carrier includes:

[0038] - A longitudinal nozzle, which is directly connected to the longitudinal end of the orifice.

[0039] - A transverse nozzle, which is directly connected to the opposite longitudinal end of the orifice, and

[0040] - One, two or more additional transverse nozzles, which are connected to the orifice and spaced apart from the longitudinal end of the orifice.

[0041] The present invention also relates to a mechanical gearbox equipped with a planetary carrier as described above.

[0042] The present invention also relates to a turbine, particularly for use in aircraft, the turbine comprising a mechanical gearbox equipped with a planetary carrier as described above. Attached Figure Description

[0043] Referring to the accompanying drawings, further features and advantages will become apparent from the following description of non-limiting embodiments of the invention, wherein:

[0044] Figure 1 This is a schematic axial cross-sectional view of a turbine using the present invention;

[0045] Figure 2 This is a partial axial cross-sectional view of a mechanical gearbox;

[0046] Figure 3 This is a partial schematic perspective view of a mechanical gearbox, and illustrates the prior art of the present invention;

[0047] Figure 4 This is a partial schematic diagram of the axial section of the planetary carrier according to the present invention for use in a mechanical gearbox of an aircraft turbine;

[0048] Figure 5 This is a schematic perspective view of a first embodiment of a nozzle for a planetary carrier according to the present invention;

[0049] Figure 6 This is a schematic perspective view of a second embodiment of a nozzle for a planetary carrier according to the present invention;

[0050] Figure 7 yes Figure 4 A magnified view of a portion;

[0051] Figure 8 yes Figure 4 Another schematic axial section view of the planetary carrier;

[0052] Figure 9 This is a schematic perspective view of a third embodiment of a nozzle for a planetary carrier according to the present invention;

[0053] Figure 10 This is a partial schematic diagram of the perspective and axial section of the mechanical gearbox according to the present invention. Detailed Implementation

[0054] Figure 1 A turbine 1 is described, which typically includes 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 via a high-pressure shaft 2, and together they form a high-pressure (HP) body. The low-pressure compressor 1a and the low-pressure turbine 1e are connected via a low-pressure shaft 3, and together they form a low-pressure (LP) body.

[0055] Fan S is driven by fan shaft 4, which in turn is driven by LP shaft 3 via gearbox 6. Gearbox 6 is typically of planetary or rotary type.

[0056] The following description permutation gearbox, wherein the planet carrier and sun gear are rotatable, and the gearbox ring gear is fixed in the engine's reference frame.

[0057] Gearbox 6 is located in the upstream portion of the turbine. The fixed structure, schematically including the upstream portion 5a and the downstream portion 5b, constitutes the engine housing or stator 5, and this fixed structure is arranged to form a housing E surrounding gearbox 6. The housing E is closed upstream by a seal at the level of a bearing allowing the fan shaft 4 to pass through, and downstream by a seal at the level through which the LP shaft 3 passes.

[0058] refer to Figure 2 The gearbox 6 includes a ring gear 14 attached to the stator 5 via a ring gear carrier (not shown), having a flexible device arranged to allow it to follow possible movements of the fan shaft 4, for example, in certain degraded operation conditions. In a planetary architecture, the ring gear carrier consists of a more or less flexible portion that drives the ring gear and a portion held by a bearing or roller bearing on which the fan is mounted.

[0059] The gearbox 6 is connected to the LP shaft 3 via splines 7, which drive the pinions of the planetary or sun gears 11. It is also connected to the fan shaft 4, which is attached to the planet carrier 13. Traditionally, the sun gear 11, whose rotation axis X coincides with the rotation axis of the turbine 1, drives a series of planetary pinions called planetary gears 12, which are evenly distributed around the circumference of the gearbox 6. The number of planetary gears 12 is typically limited to between 3 and 7.

[0060] Planetary gear 12 also rotates about the turbine axis X by meshing with the internal teeth of ring gear 14, except in the case of planetary gears that rotate only about their axis of rotation.

[0061] Each planetary gear 12 passes through, as follows Figure 2 The bearing shown can be a sliding bearing or a bearing with rolling elements (ball or roller bearings) that rotates freely around the planetary gear shaft / bearing 16 connected to the planetary carrier 13.

[0062] The rotation of planetary gear 12 around its planetary gear shaft 16 caused by the meshing of the pinion of the planetary gear with the gear ring 14 causes planetary carrier 13 to rotate around axis X, and thus causes fan shaft 4 connected to planetary carrier to rotate at a speed lower than that of LP shaft 3.

[0063] Figure 2 The diagram illustrates the oil delivery to gearbox 6 and the oil path through the gearbox. Figure 2 In this example, the arrows indicate the delivery of oil from the buffer reservoir 18 connected to the turbine stator 5 to the pinions and bearings to be lubricated.

[0064] The buffer reservoir 18 is located at the top of the gearbox 6, allowing oil to flow by gravity to the center of the gearbox. The reservoir 18 is supplied from the engine's main reservoir (not shown) via a delivery pipe 20. Oil flows from the buffer reservoir 18 into the injector 22, whose calibrated end contracts to form a nozzle.

[0065] Oil flows out of the nozzle in the form of a jet 24, formed by the combined pressure of the supply pump pressure and the weight of the oil column above it. The radial component of this jet 24 points outward from the engine and terminates in a cylindrical cup 26, the radial cross-section of which resembles a U-shape with its opening facing the axis X. When the injector 22 is fixed, the cup 26 is rotatable about the axis X and has a U-shaped portion that is always opposite the nozzle. The cup 26 forms an oil holding chamber, through which the oil is rotated to the bottom of the cup and compressed under centrifugal force.

[0066] From the bottom of the cup-shaped member 26, a series of pipes supply oil to various components of the gearbox 6 that require lubrication. These pipes are essentially of two types. A first series of pipes 28 is evenly distributed around the periphery of the gearbox 6, and their number is equal to the number of planetary gears 16. These first series of pipes 28 extend from the bottom of the cup-shaped member 26 and penetrate into the inner cavity of each planetary gear 16, which is sealed by the planet carrier 13. A second series of pipes 30 is also evenly distributed around the periphery of the gearbox, extending from the bottom of the cup-shaped member 26 to the space located between two consecutive planetary gears 13.

[0067] Oil flowing through the first conduit 28 enters the inner cavity of each planetary gear shaft and then, due to centrifugal force, enters the guide passage 32, which passes radially through these shafts. These passages 32 open at the level of the bearings supporting the planetary gears 16 on the outer periphery of the planetary gear shaft, thereby ensuring lubrication of these bearings.

[0068] The second conduit 30 extends from the bottom of the cup-shaped member 26 between the planetary gears 16 and is generally divided into multiple passages (not shown) that deliver oil to the gears formed by the planetary gears 16, the sun gear 11 and the ring gear 14.

[0069] All bearings and gears of gearbox 10 are therefore lubricated by oil from nozzle 22 and collected by cup-shaped member 26 located in front of nozzle.

[0070] In another technique not shown, the lubrication system of gearbox 6 is supplied with oil via OTB, which allows oil to be transferred from a fixed reference frame to a rotating reference frame without the need for an injector or nozzle.

[0071] Figures 3 to 10 An embodiment of the planetary carrier 113 and gearbox 106 according to the present invention is shown.

[0072] The components of the gearbox 106 and planet carrier 113 described above are indicated below by similar reference numerals increased by 100. The preceding description applies to the gearbox 106 and planet carrier 113, provided that it does not conflict with or contradict the description below.

[0073] Figure 3 The planetary carrier 113 of the gearbox 106 shown in the middle section is integral and includes a cage 113a integrally formed with a tubular cylinder 113b for driving the fan shaft 4. In other words, this technology is superior to the technology in which the planetary carrier 113 includes an assembly of a cage and a cage carrier.

[0074] The cage 113a of the planetary carrier 113 includes two substantially radial annular walls 113c, which are connected together on their outer periphery by a plurality of bridges 113d.

[0075] The cage 113a defines an internal receiving portion configured to receive the sun gear 111 and the planetary gear 116. One wall 113c is connected to the cylinder 113b, and another wall 113c includes orifices for mounting the sun gear 111 and the planetary gear 116.

[0076] Multiple bridges 113d define circumferential spaces between them, which are partially occupied by the teeth of planetary gears 116.

[0077] As mentioned above Figure 2 The function of the lubrication system of gearbox 106 is generally to supply oil to the bearings of planetary gear 116 and the gears of gearbox 106.

[0078] In the illustrated example, the impeller 134 provides the oil supply to the planetary gear 116. The impeller is mounted and fixed on the wall 113c opposite to the cylinder 113b and centered on the axis X.

[0079] The present invention may relate to the oil lubrication of the gears of gearbox 106 and / or the lubrication of the bearings of planetary gear 116, which is achieved by a nozzle.

[0080] Figure 4 A partial axial cross-sectional view of the planetary carrier 113 according to the invention is shown, the cross-sectional plane passing through one of the bridges 113d described above.

[0081] According to the present invention, the retainer 113a of the planetary carrier 113 includes at least one bore 140 extending parallel to the axis X and an oil nozzle 142, which are mounted on the retainer 113a and fluidly connected to the bore 140.

[0082] The longitudinal length L1 of the hole 140 is greater than the maximum axial dimension L of the cage 113a. 最大 30%, preferably greater than the maximum axial dimension L of the cage 113a. 最大 50%. The hole 140 can be formed by machining, for example by drilling, from one of the walls 113c of the cage. In the example shown, the hole 140 is formed through a notch 144 in the wall 113c connected to the cylinder 113b.

[0083] Figure 4 Two nozzles 142a and 142b are shown mounted on a retainer 113a.

[0084] Nozzle 142a is a transverse nozzle because it extends in a transverse or vertical direction relative to axis X and therefore relative to orifice 140. Nozzle 142a is accommodated in a transverse recess 146a located at the longitudinal end of orifice 140 and close to wall 113c opposite to cylinder 113b.

[0085] The notch 146a is formed by the outer periphery of the cage 113a, and thus by one of the bridges 113d. The notch 146a includes two coaxial cylindrical surfaces 146aa and 146ab of different diameters. The larger diameter first surface 146aa extends toward the outer periphery of the cage 113a, and the smaller diameter second surface 146ab extends radially inward from surface 146aa and has, for example, a diameter greater than the maximum radial dimension R of the cage 113a. 最大 30% (preferably, greater than the maximum radial dimension R of the cage 113a) 最大 The radial range R1 is 50% of the total.

[0086] like Figure 4 As shown, the hole 140 opens onto the recess 146a on the surface 146ab. The surface 146ab is interrupted here and includes a radially outer portion 146ab1 and a radially inner portion 146ab2, which are separated from each other by an annular valley formed in the wall 113c and opening in the axial direction. The portion 146ab2 is thus formed in the cylindrical edge 148 of the wall 113c extending around the axis X.

[0087] The edge 148 is preferably directly connected to Figure 1 The visible fan shaft 4 allows the torque transmitted from the gearbox 6 to the fan shaft 4 to pass through this edge 148. The aforementioned annular valley allows the torque transmission force to be distributed in the planetary carrier 113.

[0088] Nozzle 142a in Figure 7 The nozzle 142a is most clearly visible and is generally tubular in shape, and includes an annular collar 150 at one longitudinal end. The nozzle 142a is designed to engage radially from the outside in the recess 146a until its collar 150 rests on the cylindrical shoulder of the surfaces 146aa, 146ab that connect the recess 146a.

[0089] Preferably, a cover (not shown) is mounted on the collar 150 and enters the surface 142aa to retain the nozzle in a radially outward direction and seal the radially outer end of the nozzle 142a.

[0090] The nozzle 142a includes at least one oil spray orifice and an internal channel 152 for fluid communication between the orifice and the hole 140. For this purpose, the nozzle 142a includes a transverse orifice 154 formed opposite to the outlet of the hole. To ensure alignment of the orifice 154 and the hole 140, the nozzle 142a (particularly its collar 150) may include indexing devices complementary to the complementary devices of the cage (e.g., these devices are designed to fit together via a form fit).

[0091] The nozzle 142a includes an outer cylindrical centering surface 156 for mating with a surface 146ab of the recess 146a. Each of these surfaces 156 includes a peripheral annular groove 158 for receiving an O-ring seal (not shown). Two of these surfaces 156 are located on either side of the orifice 154 to ensure a seal between the orifice 140 and the nozzle 142a. The other surface 156 is located in a portion 146ab2 and ensures centering of the nozzle 142a in this region.

[0092] The gap between the nozzle 142a and surfaces 146aa, 146ab, especially between adjacent surfaces 146, allows the nozzle 142a to avoid being subjected to stress during the transmission of the aforementioned torque, which could cause deformation of the planetary carrier 113, particularly its edge 148.

[0093] The nozzle 142a may, for example, include one or more oil spray orifices at its radially inner end. These orifices may be oriented and configured to lubricate the connection between the spline of the sun gear 111 and the LP shaft. Alternatively, as Figure 10 As shown, nozzle 142a can be used to supply oil to the inner cavity of planetary gear 116. The same figure allows for the illustration that this cavity can be supplied by more than one nozzle 142a of the aforementioned type, preferably angularly distributed about the axis of rotation Y of the planetary gear 116. This distribution is preferably regular, such that the planet carrier 113 is axisymmetric from the perspective of the nozzle position, but ideally also axisymmetric from the perspective of its mass distribution. In the illustrated case, only the direction of the oil spray orifices at the ends of the nozzles 142 can differ from one nozzle to another, thereby lubricating different areas of the inner cavity (e.g., three).

[0094] Nozzle 142b is a longitudinal or axial nozzle because it extends parallel to axis X and is specifically aligned with orifice 140. Nozzle 142b is housed in the aforementioned recess 144.

[0095] exist Figure 5 Most clearly visible is the nozzle 142b, which is generally tubular in shape and includes sections of different diameters. The nozzle 142b is designed to engage axially in the recess 144 until one of its longitudinal ends axially abuts against the support surface 162 of the cage, where the end of the orifice 140 opposite to the nozzle 142a opens on the support surface.

[0096] In this region, the retainer 113a may include a concave receiving portion for engaging the longitudinal end of the nozzle 142b. As shown, a seal will be provided by an O-ring, which is received in a peripheral annular groove 158 in the aforementioned end of the nozzle.

[0097] The opposite end of the nozzle 142b includes a larger diameter section, which includes an outer cylindrical surface 156 for centering in the recess 144. The nozzle 142b, and particularly its surface 156, may include an indexing device complementary to the complementary device of the cage. In the illustrated example, surface 156 includes a plane 164, thus the plane is intended to mate with the complementary plane of the recess 144 by form connection.

[0098] The larger diameter section of nozzle 142b can be configured to receive oil into the connecting member via a convex-concave fit.

[0099] The nozzle 142b includes a plurality of oil spray orifices 166 and an internal channel 152 for fluid communication of these orifices 166 with the orifice 140. The channel 152 extends along the entire axial dimension of the nozzle 142b and opens at both axial ends of the nozzle. The orifices 166 are aligned front to back and are formed in an external boss 168 of the nozzle 142b. The boss 168 allows for extension of the longitudinal dimension of the orifices 166 and improves oil guidance to increase the accuracy of oil spray output. Indexing by means of a plane 164 allows the orifices 166 to be oriented in a selected direction, for example, toward the gear between the teeth of the sun gear 111 and the planet gear 116 or the gear between the teeth of the ring gear 114 and the planet gear 116.

[0100] In the case where the planetary carrier 113 includes multiple nozzles 142b, these nozzles 142b will be evenly distributed around the axis Y of the planetary gear or the axis X of the gearbox 106.

[0101] Figure 6 An alternative embodiment of the nozzle 142b is shown, wherein the larger diameter section of the nozzle 142b is replaced by an outer annular collar 150 located between two outer cylindrical surfaces 156. Each of these surfaces includes an annular groove 158 for receiving an O-ring seal (not shown).

[0102] like Figure 4 As seen, the hole 140 can be connected to additional recesses 160, 160'. These recesses 160' can be constructed and specifically sized to form oil spray orifices directly within the gearbox 106. Alternatively, the recesses 160 are sized to accommodate additional nozzles 142c, such as... Figure 8 and 9 The nozzle shown.

[0103] The hole 140 can be connected to a plurality of recesses 160 spaced apart from its longitudinal end, the recesses 160 preferably having a transverse direction relative to the hole 140 and the axis X. Figure 8In the example shown, a plurality of notches 160 extend in the same plane through the axis of the hole 140, and each notch 160 includes an inner cylindrical surface for mounting and centering the nozzle 142c.

[0104] Each nozzle 142c is therefore a transverse nozzle because it extends perpendicular to the axis X.

[0105] The nozzle 142c is generally tubular in shape and includes an outer annular collar 150 for support on the surface of the bridge 113d, with a notch 160 leading to that surface of the bridge.

[0106] The nozzle 142c is designed to engage in the notch 160 until its collar 150 rests on the surface.

[0107] The nozzle 142c includes an outer cylindrical centering surface 156, which includes a peripheral annular groove 158 for receiving an O-ring seal (not shown) that mates with the inner surface of the recess 160.

[0108] The nozzle 142c includes a single oil spray orifice 166 and an internal channel 152 for fluid communication between the orifice 166 and the orifice 140. Here, the orifice 166 is formed at one end of the channel 152 and the nozzle 142b, and is therefore aligned with the channel 152. It is not necessary to provide an indexing system for this type of nozzle 142c.

[0109] This type of nozzle 142c can be used to project oil onto the gears between the teeth of the sun gear 111 and the planetary gear 116, or between the gear ring 114 and the planetary gear 116.

[0110] In an embodiment not shown, at least a portion of the receiving recess of the nozzle 142 may be tilted relative to the orifice 140 at an angle (other than 90°).

Claims

1. A planetary carrier (113) for a mechanical gearbox (106) of a turbine (1), the planetary carrier comprising: - An integral cage (113a) extending about a rotation axis X and defining an internal receiving portion configured to receive the sun gear (111) and planet gears (116) of the mechanical gearbox, and - A lubrication system, the lubrication system comprising: - At least one hole (140), said at least one hole being formed in said cage (113a), and in the maximum axial dimension (L) of said cage 最大 Extending parallel to the rotation axis X within a range of more than 30%, and - For each of the at least two nozzles (142) in the at least one hole (140), the at least two nozzles are mounted on the retainer, and each of the at least two nozzles is mounted in a recess (144, 146a, 160) in the retainer, and includes: • At least one oil spray nozzle (166), and • Internal channel (152), the internal channel being used for fluid communication between the at least one oil spray orifice (166) and the at least one hole (140), The lubrication system is characterized in that, for each of the at least one hole (140), the lubrication system includes a longitudinal nozzle (142b) extending in a direction parallel to the axis of rotation X and mounted in a recess (144) directly connected to the longitudinal end of the at least one hole (140).

2. The planetary carrier (113) according to claim 1, wherein, For each of the at least one hole (140), the lubrication system includes at least one transverse nozzle (142a, 142c) extending in a direction perpendicular to the axis of rotation X and mounted in a recess (146a, 160) directly connected to the hole (140).

3. The planetary carrier (113) according to claim 2, wherein, The notch (146a) for mounting the transverse nozzle (142a) is located at the longitudinal end of the at least one hole (140).

4. The planetary carrier (113) according to claim 2, wherein, The transverse nozzle (142a) includes a lateral orifice (154) for fluid communication between the at least one orifice (140) and the channel (152) of the transverse nozzle (142a).

5. The planetary carrier (113) according to claim 2, wherein, The notch (160) for mounting the transverse nozzle (142c) leads to the at least one hole (140) and is spaced apart from the longitudinal end of the at least one hole.

6. The planetary carrier (113) according to any one of claims 1 to 5, wherein, At least one of the at least two nozzles (142) is generally tubular in shape and includes a peripheral annular groove (158) for receiving an O-ring seal.

7. The planetary carrier (113) according to any one of claims 1 to 5, wherein, At least one of the at least two nozzles (142) includes an outer cylindrical centering surface (156) configured to directly engage with a complementary inner cylindrical surface of the retainer (113a).

8. The planetary carrier (113) according to claim 7, wherein, Each of the at least two nozzles includes two or three external cylindrical centering surfaces (156) spaced apart from each other.

9. The planetary carrier (113) according to claim 7, wherein, At least one of the at least two nozzles includes an indexing plane (164) and / or an annular collar (150) located on its outer cylindrical centering surface (156).

10. The planetary carrier (113) according to any one of claims 1 to 5, wherein, At least one of the at least two nozzles (142b) includes two or three or more spray orifices (166), which are aligned front to back and formed in an external boss (168) of the nozzle.

11. The planetary carrier (113) according to any one of claims 1 to 5, wherein, At least one of the at least two nozzles (142c) includes a single spray orifice that extends directly into an extension of the internal channel (152) of the nozzle.

12. The planetary carrier (113) according to any one of claims 1 to 5, wherein, The planetary carrier includes: - A longitudinal nozzle (142b), which is directly connected to the longitudinal end of the at least one hole (140). - A transverse nozzle (142a), which is directly connected to the opposite longitudinal end of the at least one hole (140), and - One, two or more additional transverse nozzles (142c), said additional transverse nozzles being connected to the at least one hole (140) and spaced apart from the longitudinal end of the at least one hole (140).

13. The planetary carrier (113) according to claim 8, wherein, Each of at least one of the at least two nozzles includes an indexing plane (164) and / or an annular collar (150) located on one of the two or three outer cylindrical centering surfaces (156).

14. A turbine (1) comprising a mechanical gearbox equipped with a planetary carrier (113) according to any one of claims 1 to 13.

15. The turbine (1) according to claim 14, wherein, The turbine is used in the aircraft.

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