Assembly for a turbine engine, turbine engine and corresponding aircraft

Abstract

The invention relates to an assembly for a turbine engine having a longitudinal axis X, the assembly being configured to be arranged between a lubrication chamber of a speed reducer and a lubricant-tight zone, the assembly comprising: a casing arm configured to be provided in an air circulation duct intended to at least partially supply a gas generator of the turbine engine, the casing arm being formed by a wall delimiting a hollow interior space configured to be passed through by a cable, the hollow interior space being closed radially towards the interior by a lubricant-tight bottom partition, the bottom partition having a cable passage opening; a ring dimensioned so as to sealingly surround a portion of the cable, the ring being housed in the cable passage opening and being fastened to the bottom partition, the ring comprising a main body having a shape substantially complementary to the opening; sealing means provided at a junction interface between the ring and the opening.

Description

[0001] DESCRIPTION

[0002] TITLE: SET FOR TURBOMACHINE, TURBOMACHINE AND CORRESPONDING AIRCRAFT.

[0003] Scope of the invention

[0004] The present invention relates to the field of aeronautics, and more specifically to aircraft turbomachinery.

[0005] More specifically, the invention relates to an assembly for a turbomachine, configured to be disposed at a mechanical interface between a lubricant retention pocket, which may in particular be a lubrication chamber of a speed reducer, and a lubricant-tight zone.

[0006] The invention also relates to a turbomachine, in particular a turbojet with an unfaired fan, comprising a speed reducer operating in a lubrication chamber, and also relates to an aircraft comprising such a turbomachine.

[0007] Prior art

[0008] Typically, a turbofan engine comprises a gas generator surrounded by a nacelle, and a fan located upstream of the gas generator that generates a gas flow, at least part of which is intended to flow inside the gas generator. Such a fan may be enclosed or unenclosed.

[0009] It is also known to use a speed reducer to reduce the rotational speed between the gas generator shaft and the blower shaft so as to drive the turbomachine blower into rotation at a reduced speed.

[0010] A planetary type speed reducer, in a known manner, comprises a gear set including a central pinion, called the sun gear, a peripheral gear generally with internal teeth, called the ring gear, and a plurality of pinions arranged between the sun gear and the ring gear, called satellites.

[0011] For the proper functioning of the various components of this speed reducer, and in particular for smooth relative movement between them, it is essential that the reducer be in continuous contact with lubricant. Therefore, it is common practice to construct a lubrication chamber around the speed reducer.

[0012] Another well-known aspect of turbomachinery is that it is traversed by kilometers of cables that electrically connect the different stages. It is common for cables to pass through the turbomachine casing walls at mechanical interfaces to connect one stage to another or one zone to another. For example, in the case of a turbomachine with an outer and an inner shell between which a primary or intermediate airflow path flows, it is necessary to run cables from the inner to the outer shell. This is achieved by using casing arms, each formed by a wall delimiting a hollow internal space configured to accommodate one or more cables.

[0013] However, constraints exist in certain areas of the turbomachine, particularly at the level of the crankcase arms positioned near the lubrication chamber containing the speed reducer.

[0014] Indeed, the lubricant contained in this lubrication chamber must be kept within this chamber and not escape into other areas of the turbomachine in order to avoid any propagation, particularly to flammable areas, which would represent a significant risk of damage or even explosion of the turbomachine.

[0015] Therefore, the passage of the various cables must be done in a watertight manner at the level of the crankcase arms which would be close to or in contact with this lubrication chamber in order to avoid any lubricant leakage.

[0016] There is therefore a need to provide a solution that at least partially resolves the disadvantages listed above and in particular ensures the sealing of the passage of the various cables at the level of the crankcase arms which would be close to or in contact with this lubrication chamber.

[0017] Description of the invention

[0018] To this end, the invention relates to an assembly for a turbomachine with a longitudinal axis X, configured to be disposed between a lubrication chamber of a speed reducer and a lubricant-tight zone, said assembly comprising:

[0019] a crankcase arm configured to be provided in an air circulation channel intended to supply at least in part a gas generator of said turbomachine, said crankcase arm being formed by a wall delimiting a hollow internal space configured to be traversed by a cable, said hollow internal space being closed radially inwards by a bottom partition sealed against lubricant, said bottom partition having a cable passage orifice;

[0020] a ring dimensioned to tightly enclose a portion of said cable, said ring being housed in said cable passage orifice and being fixed to said bottom partition, said ring comprising a main body having a shape substantially complementary to said orifice; sealing means provided at the level of a junction interface between said ring and said orifice.

[0021] Thus, the solution offers a new and inventive approach that at least partially resolves the drawbacks of the prior art.

[0022] In particular, by implementing a bottom partition of the crankcase arm, therefore opposite the lubrication chamber of a speed reducer, which is sealed against lubricant, and which has a cable passage orifice sealed by the implementation of a ring sized to tightly enclose a portion of a cable, so as to allow the passage of this cable in a sealed manner, the risk of lubricant escaping into other undesired areas of the turbomachine is limited or even eliminated, and consequently any risk of damage to the turbomachine or even explosion due to possible leaks of this type is limited or even eliminated.

[0023] According to a particular aspect of at least one embodiment of the invention, said sealing means are provided on a periphery of said ring.

[0024] According to a particular aspect of at least one embodiment of the invention, said ring has a groove cut around a periphery of said main body, and said sealing means comprise a circular seal housed at least partially in said groove.

[0025] According to a particular aspect of at least one embodiment of the invention, said ring comprises a hollow tubular lower extension formed in continuity with said main body at a lower end of said main body so as to guide an entry of said electrical cable into said main body, and / or said ring has a hollow tubular upper extension formed in continuity with said main body at an upper end of said main body so as to guide an entry of said cable into said hollow internal space.

[0026] According to a particular aspect of at least one embodiment of the invention, said ring comprises a tab extending from said lower end of said main body and having a bore, said ring being fixed to said bottom partition by fastening means passing through said bore and fitting into a blind hole formed in a radially lower surface of said bottom partition.

[0027] According to a particular aspect of at least one embodiment of the invention, said orifice has a notch, and said assembly includes retaining means provided against a lower end of said main body and inserted into said notch so as to ensure radial retention of said ring in said orifice.

[0028] According to a particular aspect of at least one embodiment of the invention, said bottom partition has two cable passage holes, and said assembly includes two rings, each ring being housed in a separate cable passage hole and being dimensioned to tightly enclose a portion of a separate cable, said two rings being held in radial position by means of a support piece fixed to said bottom partition and provided in contact with said means for retaining each of said two rings.

[0029] According to a particular aspect of at least one embodiment of the invention, said bottom partition is made in one piece.

[0030] According to a particular aspect of at least one embodiment of the invention, said bottom partition comprises:

[0031] a fixed, one-piece part with said wall of said crankcase arm, and

[0032] a removable plate fixed to said fixed part and carrying said cable passage hole,

[0033] said assembly further comprising sealing means provided at the level of a junction interface between the fixed part and the removable plate.

[0034] According to a particular aspect of at least one embodiment of the invention, said removable plate is composed of two half-shells fixed together and enclosing said ring.

[0035] According to a particular aspect of at least one embodiment of the invention, said fixed part has a rim, said removable plate bearing radially against said rim.

[0036] According to a particular aspect of at least one embodiment of the invention, the removable plate has at least one hole formed at at least one of its ends and is fixed to said fixed part by fastening means passing through said at least one hole and fitting into a blind hole formed in a radially lower surface of said bottom partition.

[0037] According to a particular aspect of at least one embodiment of the invention, said ring is made at least partially from a lubricant-proof material.

[0038] Such materials improve the sealing of the ring and therefore of the entire assembly.

[0039] The invention also relates to a turbomachine comprising an assembly according to one of the aforementioned embodiments.

[0040] According to a particular aspect of at least one embodiment of the invention, the assembly is arranged between an outer shell of said turbomachine and an inner shell of said turbomachine and passes through a channel intended to supply at least part of a gas generator of said turbomachine.

[0041] According to a particular aspect of at least one embodiment of the invention, said vein is an intermediate vein intended to be split downstream.

[0042] According to a particular aspect of at least one embodiment of the invention, said turbomachine is of the unshod fan type.

[0043] The invention also relates to an aircraft, comprising at least one turbomachine according to the aforementioned embodiment. Presentation of the figures

[0044] The invention, and its various advantages, will be more easily understood in light of the following description of illustrative and non-limiting embodiments thereof, and the accompanying drawings, among which:

[0045] [Fig. 1] illustrates a schematic longitudinal cross-sectional view of an aircraft turbomachine according to the invention;

[0046] [Fig. 2], [Fig. 3] and [Fig. 4] are respectively cross-sectional, bottom perspective, and close-up cross-sectional views of an assembly according to a first embodiment of the invention;

[0047] [Fig. 5] is a perspective view of a ring according to the first embodiment of the invention;

[0048] [Fig. 6], [Fig. 7] and [Fig. 8] are respectively perspective views from below, cross-sectional views from below, and cross-sectional views from above according to the first embodiment of the invention;

[0049] [Fig. 9] and [Fig. 10] are respectively cross-sectional and close-sectional views of an assembly according to a second embodiment of the invention;

[0050] [Fig. 11] is a cross-sectional view of a crankcase arm according to the second embodiment of the invention;

[0051] [Fig. 12] and [Fig. 13] are respectively cross-sectional and close-sectional views of an assembly according to a third embodiment of the invention;

[0052] [Fig. 14] is a cross-sectional view of a crankcase arm according to the third embodiment of the invention;

[0053] [Fig. 15] and [Fig. 16] are respectively cross-sectional and close-sectional views of an assembly according to a fourth embodiment of the invention;

[0054] [Fig. 17] is a cross-sectional view of a crankcase arm according to the fourth embodiment of the invention;

[0055] [Fig. 18] and [Fig. 19] are two perspective views of an assembly according to the fourth embodiment of the invention;

[0056] [Fig. 20] and [Fig. 21] are two exploded perspective views of an assembly according to the fourth embodiment of the invention;

[0057] [Fig. 22] and [Fig. 23] are two perspective views from below of a crankcase arm according to the fourth embodiment of the invention;

[0058] [Fig. 24] and [Fig. 25] are respectively cross-sectional and close-sectional views of an assembly according to a fifth embodiment of the invention;

[0059] [Fig. 26] is a cross-sectional view of a crankcase arm according to the fifth embodiment of the invention;

[0060] [Fig. 27] and [Fig. 28] are two perspective views of an assembly according to the fifth embodiment of the invention, and [Fig. 29], [Fig. 30], [Fig. 31] are three exploded perspective views of an assembly according to the fifth embodiment of the invention.

[0061] Detailed description of an embodiment of the invention

[0062] Throughout this description, the radial direction is defined with respect to a radius of the turbomachine. This description is not exhaustive; each feature of one embodiment can be advantageously combined with any other feature of any other embodiment, according to any technically functional combination.

[0063] It should be noted from the outset that the figures are not necessarily to scale.

[0064] Figure 1 schematically illustrates a turbomachine 1 of the turbojet type with a blower (called turbofan in English terminology) according to a half longitudinal cross-sectional view.

[0065] The turbomachine 1 extends along a longitudinal axis X, corresponding to an axis of rotation of the rotating elements of the turbomachine 1.

[0066] As is known, the turbomachine 1 here comprises a low-pressure stage and a high-pressure stage, and thus includes a low-pressure compressor 12 and a high-pressure compressor 13 together forming the compressor, a combustion chamber 14, a high-pressure turbine 15, and a low-pressure turbine 16 together forming the turbine. The turbomachine 1 includes a low-pressure shaft 17, to which the low-pressure compressor 12 and the low-pressure turbine 16 are connected, and together form an external drive coil. The turbomachine 1 also includes a high-pressure shaft 18, to which the high-pressure compressor 13 and the high-pressure turbine 15 are connected, and together form an internal drive coil. The low-pressure shaft 17 and the high-pressure shaft 18 are collinear with their longitudinal axis X and are mounted on bearings on a housing 19 of the turbomachine 1.

[0067] The turbomachine 1 also includes a blower 101 which is configured to be driven in rotation by means of the turbine, and in particular by the low-pressure shaft 17. The turbomachine 1 here includes a blower shaft 110, on which the blower 101 is mounted.

[0068] In the illustrated example, the casing 19 includes a fairing 120 which surrounds the blower 10, which is said to be faired, however the casing 19 may also be without fairing 120 and the blower is then said to be unfaired.

[0069] The turbomachine 1 also includes a speed reducer 100, through which the fan 101 is driven in rotation at a reduced speed relative to the rotational speed of the low-pressure shaft 17. As is known, this speed reducer 100 is located in a lubrication chamber. Therefore, and to allow the passage of cables to a sealed area, the turbomachine, according to the invention, includes a turbomachine assembly 1 with a longitudinal axis X, configured to be positioned between the lubrication chamber L of the speed reducer 100 and the lubricant-sealed area E. It should be noted that, according to one embodiment, this assembly can, in particular, be positioned between an outer shell of the turbomachine and an inner shell of this turbomachine and can pass through a channel intended to supply at least part of a gas generator of the turbomachine.

[0070] This vein can, for example, be an intermediate vein, that is to say, a vein coming from outside the turbomachine and intended to be split downstream.

[0071] We now present, in relation to figures 2 to 8, a first embodiment of the invention.

[0072] As illustrated, the assembly 9 for turbomachine 1 with longitudinal axis X according to this embodiment includes a casing arm 2 configured to be provided in an air circulation channel intended to supply at least in part a gas generator of the turbomachine 1.

[0073] This crankcase arm 2 is formed by a wall delimiting a hollow internal space 20 configured to be traversed by a cable 10. The hollow internal space 20 is closed radially inwards by a bottom partition 21 that is lubricant-tight. More precisely, this bottom partition 21 forms a mechanical interface between the lubrication chamber L and the sealed area E.

[0074] In this embodiment, the bottom partition 21 is made in one piece. In other words, this bottom partition 21 is a single unit with the wall of the crankcase arm 2.

[0075] According to the invention, the bottom partition 21 further has an opening 6 allowing the cable 10 to pass through.

[0076] It should be noted that in the illustrated embodiment, the bottom partition 21 has two openings 6, each allowing a cable to pass through. As these two openings are similar, only one is shown hereafter.

[0077] This assembly 9 also includes a ring 3 sized to tightly enclose a portion of the cable 10.

[0078] By tight sealing, we mean here that the ring 3 is arranged around the cable 10 and surrounds this cable 10 with a gap small enough that the lubricant cannot pass between the cable 10 and the ring 3.

[0079] Ring 3 is housed in cable passage hole 6 and is fixed to the bottom partition 21.

[0080] As with the ports 6, the assembly illustrated in this embodiment comprises two rings 3, each housed in a separate port. Since these rings 3 are similar, only one is shown hereafter.

[0081] In this embodiment, the ring 3 is made at least partially from a lubricant-tight material. As illustrated, this ring 3 comprises a main body 30 having a shape substantially complementary to the orifice 6.

[0082] More specifically, in this embodiment, the orifice 6 and the main body 30 have a hollow circular cylindrical shape of complementary dimensions.

[0083] In order to seal the junction interface between the ring 3 and the orifice 6 so as not to impair the sealing of the mechanical interface between the lubrication chamber L of the speed reducer 100 and the sealed area E, the assembly further includes sealing means provided at the junction interface between the ring 3 and the orifice 6.

[0084] As illustrated in figures 2 to 8, the sealing means are provided here on a periphery of ring 3.

[0085] In particular, the ring 3 has at least one groove 35 cut on a periphery of the main body 30, and the sealing means include at least one circular seal 5 housed at least partially in the at least one groove 35.

[0086] Here, the ring 3 has two grooves 35 cut around the periphery of the main body 30, and the sealing means include two circular seals 5 housed at least partially in a separate groove 35 among the two grooves 35.

[0087] In addition, and as particularly visible in figure 5, the ring 3 includes a lower hollow tubular extension 31 formed in continuity with the main body 30 at a lower end of the main body 30 so as to guide an entry of the electrical cable 10 into the main body 30, and an upper hollow tubular extension 32 formed in continuity with the main body 30 at an upper end of the main body 30 so as to guide an entry of the cable 10 into the hollow interior space 20, and consequently guide an entry of the ring 3 into the hollow interior space 20.

[0088] According to one variant, the ring could comprise only a hollow tubular lower extension or a hollow tubular upper extension.

[0089] In order to be fixed to the bottom partition 21, the ring 3 includes a tab 33 extending from the lower end of the main body 30 and having a bore 34.

[0090] This ring 3 is fixed to the bottom partition 21 by means of fixing through the bore 34 and fitting into a blind hole 62 formed in a radially lower surface of the bottom partition 21.

[0091] Such fastening means may include a screw 4 as illustrated in the figures of this embodiment.

[0092] As shown in Figure 4, the orifice 6 also has a restricted upper portion 60 with a cross-section smaller than a cross-section of the rest of the orifice 6, such that only the hollow tubular upper extension 32 passes through this restricted upper portion 60. This cross-section allows for better radial positioning of the ring and even preserves the seal even if the tab 33 breaks.

[0093] We now present, in relation to figures 9 to 11, a second embodiment of the invention.

[0094] As illustrated, the assembly 9' according to this embodiment includes a crankcase arm 2' configured to be provided in an air circulation channel intended to supply at least in part a gas generator of the turbomachine 1.

[0095] This crankcase arm 2' is formed by a wall delimiting a hollow internal space 20' configured to be traversed by a cable 10. The hollow internal space 20' is closed radially inwards by a bottom partition 21' that is lubricant-tight. More precisely, this bottom partition 21' forms a mechanical interface between the lubrication chamber L and the sealed area E.

[0096] In this embodiment, the bottom partition 21' is made in one piece. In other words, this bottom partition 21' is a single piece with the housing arm wall 2'.

[0097] According to the invention, the bottom partition 21' further has an opening 6' allowing the cable 10 to pass through.

[0098] It should be noted that in the illustrated embodiment, the bottom bulkhead 21' has two 6' openings, each allowing a cable to pass through. Since these two openings are similar, only one is shown hereafter.

[0099] This 9' assembly also includes a 3' ring sized to tightly enclose a portion of the cable 10.

[0100] By tight sealing, we mean here that the ring 3' is arranged around the cable 10 and surrounds this cable 10 with a gap small enough that the lubricant cannot pass between the cable 10 and the ring 3'.

[0101] The 3' ring is housed in the 6' cable passage hole and is fixed to the 21' bottom bulkhead.

[0102] As with the 6' ports, the assembly illustrated in this embodiment comprises two 3' rings, each housed in a separate port. Since these 3' rings are similar, only one is shown hereafter.

[0103] In this second embodiment, the ring 3' is made at least partially from a lubricant-proof material.

[0104] As illustrated, this 3' ring comprises a 30' main body having a shape substantially complementary to the 6' orifice.

[0105] More specifically, in this embodiment, the orifice 6' and the main body 30' have a hollow circular cylindrical shape of complementary dimensions.

[0106] In order to seal the junction interface between the ring 3' and the orifice 6' so as not to impair the sealing of the mechanical interface between the lubrication chamber L and the sealed area E, the assembly further includes sealing means provided at the junction interface between the ring 3' and the orifice 6'.

[0107] As illustrated in figures 9 and 10, the sealing means are provided here on a perimeter of the ring 3'.

[0108] In particular, the ring 3' has at least one groove (not shown) cut around one periphery of the main body 30', and the sealing means include at least one circular seal 5' housed at least partially in the at least one groove.

[0109] Here, the 3' ring has two grooves cut around the perimeter of the main body 30', and the sealing means include two circular seals 5' housed at least partially in a separate groove among the two grooves.

[0110] In order to ensure that the ring 3' is held in the radial position in the orifice 6', it is necessary to prevent radial movement towards the sealing area, i.e. radial movement outwards, and to prevent radial movement towards the lubrication chamber, i.e. radial movement inwards.

[0111] Therefore, in order to ensure radial positioning of the ring 3' in the orifice 6', this orifice 6' has a notch 60', and the assembly includes retaining means 300' provided against a lower end of the main body 30' and inserted into the notch 60'.

[0112] Such retaining means 300' inserted in the notch 60' prevent outward radial movement of the ring 3' relative to the orifice 6'.

[0113] In addition, the orifice 6' has a groove 61', and the assembly includes fastening means 4' locked in the groove 61' and pressed against the retaining means 300'.

[0114] Such fixing means 4' locked in the groove 61' prevent radial displacement towards the inside of the ring 3' relative to the orifice 6'.

[0115] Such fastening means may include a 4' washer as illustrated in the figures of this embodiment.

[0116] We now present, in relation to figures 12 to 14, a third embodiment of the invention.

[0117] As illustrated, the 9" assembly according to this embodiment includes a 2" crankcase arm configured to be provided in an air circulation channel intended to supply at least part of a gas generator of the turbomachine 1.

[0118] This 2" housing arm is formed by a wall delimiting a 20" hollow internal space configured to allow passage of a cable 10. The 20" hollow internal space is closed radially inwards by a 21" bottom partition that is lubricant-tight. More precisely, this 21" bottom partition forms a mechanical interface between the lubrication chamber L and the sealed area E. In this embodiment, the 21" bottom partition is made in one piece. In other words, this 21" bottom partition is a single piece with the 2" housing arm wall.

[0119] According to the invention, the bottom partition 21" further has at least one orifice 6", here two similar and juxtaposed orifices 6", allowing each to pass a cable 10.

[0120] This 9" assembly further includes at least one 3" ring sized to tightly enclose a portion of the cable 10. As with the 6" holes, the assembly illustrated in this embodiment includes two 3" rings, each housed in a separate hole.

[0121] By "sealing" means that each 3" ring is positioned around the cable 10 and surrounds this cable 10 with a gap small enough that lubricant cannot pass between the cable 10 and the 3" ring.

[0122] Each 3" ring is housed in a separate 6" cable passage hole and is fixed to the 21" bottom bulkhead.

[0123] In this third embodiment, each 3" ring is made at least partially from a lubricant-proof material.

[0124] As illustrated, each 3" ring comprises a 30" main body having a shape substantially complementary to the 6" orifice into which it is inserted.

[0125] More specifically, in this embodiment, each 6" orifice and the associated 30" main body have a hollow circular cylindrical shape of complementary dimensions.

[0126] In order to seal the junction interface between each 3" ring and the 6" orifice so as not to impair the sealing of the mechanical interface between the lubrication chamber L and the sealed zone E, the assembly further includes sealing means provided at the junction interface between each 3" ring and the 6" orifice.

[0127] As illustrated in figures 12 and 13, the sealing means are provided here on one periphery of each 3" ring.

[0128] More specifically, each 3" ring has at least one groove (not shown) cut around one circumference of the main 30" body, and the sealing means include at least one 5" circular gasket housed at least partially in at least one groove.

[0129] Here, each 3" ring has two grooves cut around the perimeter of the main 30" body, and the sealing means include two 5" circular seals housed at least partially in a separate groove among the two grooves.

[0130] To ensure that each 3" ring is held radially in the 6" orifice, it is necessary to prevent radial movement towards the sealing area, i.e., outward radial movement, and to prevent radial movement towards the lubrication chamber, i.e., inward radial movement. Therefore, to ensure that each 3" ring is held radially in the 6" orifice, each 6" orifice has a 60" notch, and for each 3" ring, the assembly includes 300" retaining means formed against a lower end of the 30" main body and inserted into the 60" notch.

[0131] Such 300" retaining means inserted in the 60" notch prevent outward radial movement of each 3" ring relative to the 6" orifice.

[0132] In addition, the two 3" rings are held in radial position by means of a 40" support piece fixed to the 21" bottom partition and provided in contact with the 300" retaining means of each of the two 3" rings.

[0133] The 40" support piece includes a portion with a hole (not shown) and is fixed to the 21" bottom bulkhead by fastening means passing through the hole and fitting into a 62" blind hole formed in a radially lower surface of the 21" bottom bulkhead.

[0134] Such fastening means may include a 4" screw as illustrated in the figures of this embodiment.

[0135] We now present, in relation to figures 15 to 23, a fourth embodiment of the invention.

[0136] As illustrated, the 9" assembly for turbomachine 1 with longitudinal axis X according to this embodiment includes a 2" crankcase arm configured to be provided in an air circulation channel intended to supply at least part of a gas generator of the turbomachine 1.

[0137] This 2" housing arm is formed by a wall delimiting a 20" hollow internal space configured to allow passage of a cable 10. The 20" hollow internal space is closed radially inwards by a 21" bottom partition that is lubricant-tight. More precisely, this 21" bottom partition forms a mechanical interface between the lubrication chamber L and the sealed area E.

[0138] According to the invention, the bottom partition 21" further has an opening 6" allowing a cable 10 to pass through.

[0139] It should be noted that in the illustrated embodiment, the 21" back bulkhead has two 6" openings, each allowing a cable to pass through. Since these two openings are similar, only one is shown hereafter.

[0140] This 9" assembly also includes a 3" ring sized to tightly enclose a portion of the cable 10.

[0141] By "sealing" means that the 3" ring is positioned around the cable 10 and surrounds this cable 10 with a gap small enough that lubricant cannot pass between the cable 10 and the 3" ring.

[0142] The 3" ring is housed in the 6" cable entry hole and is fixed to the bottom bulkhead. As with the 6" holes, the assembly shown in this embodiment comprises two 3" rings, each housed in a separate hole. Since these 3" rings are similar, only one is shown hereafter.

[0143] In this embodiment, the 3" ring is made at least partially from a lubricant-proof material.

[0144] As illustrated, this 3" ring comprises a 30" main body having a shape substantially complementary to the 6" orifice.

[0145] More specifically, in this embodiment, the 6" orifice and the 30" main body have a hollow circular cylindrical shape of complementary dimensions.

[0146] In order to seal the junction interface between the 3" ring and the 6" orifice, the assembly further includes sealing means provided at the junction interface between the 3" ring and the 6" orifice.

[0147] As illustrated by figures 15 and 17, the sealing means 5'" are positioned here against a perimeter of the ring 3'", and more particularly against a major part of the perimeter of the main body 30'".

[0148] In this embodiment, the 21" back bulkhead is made of two pieces. More specifically, the 21" back bulkhead comprises:

[0149] a fixed, one-piece part with the 2" crankcase arm wall, and

[0150] a removable 7" plate attached to the fixed part and carrying the 6" cable passage hole.

[0151] In order to seal the junction interface 79" between the fixed part and the removable plate 7", the assembly further includes sealing means 71".

[0152] Here, and as can be seen in particular in figure 17, the sealing means 71'" are in the form of a plate which is superimposed on the removable plate and are formed in one piece with the sealing means 5'" provided at the interface of the junction between the ring 3'" and the orifice 6'".

[0153] The fact that all the sealing means are formed in a single block further improves the sealing by not leaving space between different sealing means.

[0154] In addition, the fixed part has a rim 78" formed at the junction interface 79" in continuity with the surface 77" so that the removable plate 7" comes to rest radially against the rim 78".

[0155] More specifically, here, the removable plate 7" indirectly bears radially against the rim 78" because the removable plate 7" bears radially against the sealing means 71" which bear against the rim 78". To ensure that the removable plate 7" remains in a radial position relative to the fixed part of the bottom bulkhead 21", the removable plate 7" has at least one hole formed at at least one of its ends, here two holes not shown. The removable plate 7" is fixed to the fixed part by fastening means 75" passing through each of the holes and fitting into a blind hole 76" formed in a radially lower surface of the bottom bulkhead 21", and more specifically in the fixed part of the bottom bulkhead.

[0156] Such fastening means may include a screw as illustrated in the figures of this embodiment.

[0157] Here, the removable 7" turntable is composed of two half-shells 70A'", 70B'".

[0158] More specifically, the two half-shells 70A'", 70B'" are fixed together by fixing means 72'", which in this embodiment are two screws connecting two protruding tabs of each of the two half-shells in order to have a fixing point on each side of each half-shell.

[0159] The two half-shells are fixed together and clamp the 3' ring(s), here the two 3' rings.

[0160] As you can see, the 3" rings are angled relative to the 7" removable plate. This angle prevents the cable from undergoing excessive changes in direction, thus avoiding the risk of damage.

[0161] We now present, in relation to figures 24 to 31, a fifth embodiment of the invention.

[0162] As illustrated, the 9" assembly for the turbomachine 1 with longitudinal axis X, according to this embodiment, comprises a 2" housing arm configured to be located within an air circulation channel intended to supply at least part of a gas generator of the turbomachine 1. This 2" housing arm is formed by a wall delimiting a hollow internal space 20" configured to be traversed by a cable 10. The hollow internal space 20" is closed radially inwards by a bottom partition 21" that is lubricant-tight. This bottom partition 21" forms a mechanical interface between the lubrication chamber L and the sealed area E.

[0163] According to the invention, the bottom partition 21"" further has an opening 6"" allowing the cable 10 to pass through.

[0164] It should be noted that in the illustrated embodiment, the 21" back bulkhead has two 6" openings, each allowing a cable to pass through. Since these two openings are similar, only one is shown hereafter.

[0165] This 9" assembly further includes a 3" ring dimensioned to tightly clamp a portion of the cable 10. By tightly clamping, it is meant here that the 3" ring is arranged around the cable 10 and surrounds this cable 10 with a gap small enough that lubricant cannot pass between the cable 10 and the 3" ring.

[0166] The 3"" ring is housed in the 6"" cable passage hole and is fixed to the bottom bulkhead.

[0167] As with the 6" ports, the assembly illustrated in this embodiment comprises two 3" rings, each housed in a separate port. Since these 3" rings are similar, only one is shown hereafter.

[0168] In this embodiment, the 3"" ring is made at least partially from a lubricant-proof material.

[0169] As illustrated, this 3"" ring comprises a 30"" main body having a shape substantially complementary to the 6"" orifice.

[0170] More specifically, in this embodiment, the 6"" orifice and the 30"" main body have a hollow circular cylindrical shape of complementary dimensions.

[0171] In order to seal the junction interface between the 3"" ring and the 6"" orifice, the assembly further includes sealing means (not shown) provided at the junction interface between the 3"" ring and the 6"" orifice.

[0172] In this embodiment, the 21" back panel is made of two pieces. More specifically, the 21" back panel comprises:

[0173] a fixed, one-piece part with the 2" housing arm wall, and

[0174] a removable 7"" plate attached to the fixed part and carrying the 6"" cable passage hole(s).

[0175] In addition, the fixed part has a 78"" rim formed at the junction interface so that the removable 7"" plate rests radially against the 78"" rim.

[0176] In order to seal the interface between the fixed part and the removable plate 7", the assembly further includes sealing means 71". Here, and as can be seen in particular in figure 17, the sealing means 71" are provided on an upper surface of the removable plate 7" which rests against the rim 78".

[0177] To ensure the removable 7" plate remains in radial position relative to the fixed part of the bottom bulkhead 21", the removable 7" plate has at least one hole formed at at least one of its ends, here two holes not shown. The removable 7" plate is fixed to the fixed part by fastening means 75", here screws, passing through each of the holes and each fitting into a blind hole 76" formed in a radially lower surface of the bottom bulkhead 21", and more specifically in the fixed part of the bottom bulkhead.

[0178] Here, the removable 7" plate is composed of two half-shells 70A"", 70B"". More particularly, the two half-shells 70A"", 70B"" are fixed together by fixing means 72"", which in this embodiment include a screw passing through a bore made opposite each other in each of the two half-shells.

[0179] The two half-shells are fixed together and clamp the 3" ring(s), here the two 3" rings.

[0180] In this embodiment, the two half-shells 70A"", 70B"" have complementary shapes but are not symmetrical.

[0181] One could foresee a variant in which the two half-shells would have a similar and symmetrical shape, so that each of the two half-shells represents half of the removable plate.

Claims

DEMANDS

1. Assembly (9, 9', 9", 9"', 9"") for a turbomachine (1) with a longitudinal axis (X), configured to be disposed between a lubrication chamber (L) of a speed reducer (100) and a lubricant-sealed zone (E), said assembly comprising: a crankcase arm (2, 2', 2", 2'", 2"") configured to be provided in an airflow channel intended to supply at least part of a gas generator of said turbomachine (1), said crankcase arm (2, 2', 2", 2'", 2"") being formed by a wall delimiting a hollow internal space (20, 20', 20", 20'", 20"") configured to be traversed by a cable (10), said hollow internal space (20, 20', 20", 20"', 20"") being closed radially inwards by a bottom partition (21, 21', 21", 21'", 21"") sealed against lubricant, said bottom partition (21, 21', 21", 21'", 21"") having a cable passage opening (6, 6', 6", 6'", 6"") ; a ring (3, 3', 3", 3'", 3"") dimensioned to tightly enclose a portion of said cable (10), said ring (3, 3', 3", 3'", 3"") being housed in said cable passage orifice (6, 6', 6", 6'", 6"") and being fixed to said bottom bulkhead (21, 21', 21", 21'", 21""), said ring (3, 3', 3", 3'", 3"") comprising a main body (30, 30', 30", 30'", 30"") having a shape substantially complementary to said orifice (6, 6', 6", 6'", 6""); sealing means provided at the level of a junction interface between said ring (3, 3', 3", 3'", 3"") and said orifice (6, 6', 6", 6'", 6"").

2. Assembly according to claim 1, characterized in that said sealing means are provided on a periphery of said ring (3, 3', 3", 3'", 3"").

3. Assembly according to any one of claims 1 or 2, characterized in that said ring (3, 3', 3") has a groove (35) cut on a periphery of said main body (30, 30', 3"), and in that said sealing means comprise a circular seal (5, 5', 5") housed at least partially in said groove (35).

4. Assembly according to any one of claims 1 to 3, characterized in that said ring (3) comprises a hollow tubular lower extension (31) formed in continuity with said main body (30) at a lower end of said main body (30) so as to guide an entry of said electrical cable (10) into said main body (30), and / or said ring (3) has a hollow tubular upper extension (32) formed in continuity with said main body (30) at an upper end of said main body (30) so as to guide an entry of said cable (10) into said hollow interior space (20).

5. Assembly according to claim 4, characterized in that said ring (3) comprises a tab (33) extending from said lower end of said main body (30) and having a bore (34), said ring (3) being fixed to said bottom partition (21) by fastening means passing through said bore and fitting into a blind hole (62) formed in a radially lower surface of said bottom partition (21).

6. Assembly according to any one of claims 1 to 5, characterized in that said orifice (6', 6") has a notch (60', 60"), and in that said assembly comprises retaining means (300', 300") provided against a lower end of said main body (30', 30") and inserted into said notch (60', 60") so as to ensure radial retention of said ring (3', 3") in said orifice (6', 6").

7. Assembly according to claim 6, characterized in that said bottom partition (21") has two cable passage holes (6"), and in that said assembly comprises two rings (3"), each ring (3") being housed in a separate cable passage hole (6") and being dimensioned to tightly enclose a portion of a separate cable (10), said two rings (3") being held in radial position by means of a support piece (40") fixed to said bottom partition (21") and provided in contact with said retaining means (300") of each of said two rings (3'").

8. Assembly according to any one of the preceding claims, characterized in that said bottom partition (21, 21', 21") is made in one piece.

9. Assembly according to any one of claims 1 to 7, characterized in that said bottom partition (21'", 21"") comprises: a fixed one-piece part with said wall of said crankcase arm (2'", 2""), and a removable plate (7'", 7"") fixed to said fixed part and carrying said cable passage opening (6'", 6""), said assembly further comprising sealing means (71'", 71"") provided at the level of a junction interface between the fixed part and the removable plate (7"', 7"").

10. Assembly according to claim 9, characterized in that said removable plate (7"', 7"") is composed of two half-shells (70A'", 70B'", 70A"" , 70B"") fixed together and enclosing said ring (3'", 3"").

11. Assembly according to any one of claims 9 or 10, characterized in that said fixed part has a rim (78'', 78'"), said removable plate (7'", 7'") bearing radially against said rim (78'", 78'").

12. Assembly according to any one of claims 9 to 11, characterized in that said removable plate (7'", 7"") has at least one bore formed at at least one of its ends, said removable plate (7"', 7"") being fixed to said fixed part by means of fixing passing through said at least one bore and fitting into a blind hole (76'", 76"") formed in a radially lower surface of said bottom partition (21'", 21"").

13. Turbomachine (1) characterized in that it comprises an assembly (9, 9', 9", 9'", 9"") according to any one of claims 1 to 12.

14. Aircraft, characterized in that it comprises at least one turbomachine according to claim 13.

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