A twin-ducted turbine engine including at least one accessory or equipment

Abstract

A double-ducted turbine engine (100A) comprises a fixed casing (117, 118, 121), a first shaft (122) called a low-pressure shaft, a second shaft (123) called a high-pressure shaft, and at least one accessory (125, 126) designed to be driven by an electric motor powered by electrical energy, the turbine engine also comprising: a first intermediate shaft (127) designed to obtain mechanical power from the low-pressure shaft, a second intermediate shaft (128) designed to obtain mechanical power from the high-pressure shaft, and an electric power generator assembly (129) coupled to the first intermediate shaft on one hand and to the second intermediate shaft on the other hand. The generator assembly (129) is arranged to receive mechanical power from the first intermediate shaft on the one hand and from the second intermediate shaft on the other hand, the generator assembly being further designed to convert the mechanical power received from the first intermediate shaft and the second intermediate shaft into electrical energy so as to power an electric motor driving one or more accessories, the electrical energy powering the electric motor driving one or more accessories being derived simultaneously from the mechanical power obtained from the low-pressure shaft and the mechanical power obtained from the high-pressure shaft, the generator assembly (129) being housed in an arm (121) which is located in the lower portion of the turbine engine (100A) and extends vertically into the dual-ducted flow channel (106).

Description

Technical Field

[0001] The present invention relates to a double-ducted turbine engine comprising at least one accessory or device, such as an oil pump, a fuel pump or even a hydraulic pump. Background Art

[0002] Conventionally, a double-ducted turbine engine includes a fan for inhaling air flow, and the air flow is divided into a primary air flow and a secondary air flow downstream of the fan. The primary air flow circulates in a primary air flow flow channel (referred to as a primary flow path) within a core of the turbine engine extending along a longitudinal axis in an axial direction, and the secondary air flow bypasses the core in a secondary air flow flow channel (referred to as a secondary flow path).

[0003] In the primary flow path, the primary airflow passes through the low-pressure compressor, the high-pressure compressor, the combustion chamber, the high-pressure turbine, the low-pressure turbine and the exhaust nozzle from upstream to downstream in the axial direction of the airflow. In the secondary flow path, the secondary airflow passes through the fan rectifier.

[0004] The low-pressure compressor and the low-pressure turbine are connected by a first shaft rotating about a longitudinal axis, called the low-pressure shaft, while the high-pressure compressor and the high-pressure turbine are connected by a second shaft rotating about the low-pressure shaft, called the high-pressure shaft. Both the low-pressure shaft and the high-pressure shaft are part of the core of the turbine engine.

[0005] When the turbine engine has a high bypass ratio (also called “BPR”), it may be advantageous for the fan to be driven mechanically by the low-pressure shaft through a reduction gear.

[0006] In order to lubricate and cool this reduction gear, it is known to equip the turbine engine with a lubrication system, in particular comprising an oil tank and an oil circuit of a lubrication pump, the lubrication pump being mechanically driven by the transmission gearbox, also known as the accessory gearbox or "AGB", and receiving its mechanical power from the high-pressure shaft via an intermediate shaft, known as the radial drive shaft (RDS).

[0007] However, during the turbine engine's "windmilling" phase, corresponding to the fan's automatic rotation, the high-pressure shaft's rotational speed is lower than that of the low-pressure shaft. Consequently, the mechanical power drawn from the high-pressure shaft and transmitted to the oil pump may be insufficient to deliver the oil required to lubricate and cool the reduction gear, which, however, is deflected by the fan's automatic rotation and risks damage or even fracture.

[0008] If the turbine engine does not include a reduction gear, it is also possible that during the "windmilling" phase, the oil pump will rotate too slowly to deliver all the oil required to lubricate and cool the bearings supporting the high-pressure and low-pressure shafts. This may require an auxiliary lubrication system, such as a second oil pump. A single oil pump is typically provided, but its size is influenced by the lubrication constraints during the low rotational speeds of the high-pressure shaft.

[0009] Regardless of whether the turbine engine includes a reduction gear or not, the lubrication constraints during low rotational speeds of the high-pressure shaft have a significant impact on the size, space requirements and mass of the lubrication system driven by the mechanical power generated by the high-pressure shaft.

[0010] Similar difficulties can be found in low speeds involving other accessories, such as the fuel pump of a turbine engine. Summary of the Invention

[0011] The present invention aims to overcome the disadvantages mentioned below by proposing a twin-ducted turbine engine comprising a low-pressure shaft, a high-pressure shaft and an electric generator assembly which derives mechanical power on the one hand from the low-pressure shaft via a first intermediate shaft and on the other hand from the high-pressure shaft via a second intermediate shaft in order to power one or more accessories such as an oil pump with electrical energy.

[0012] More specifically, the present invention relates to a double-ducted turbine engine, comprising a fan and a splitter nose from upstream to downstream in the axial direction of airflow, wherein a primary airflow flow passage, referred to as a primary flow path, and a secondary airflow flow passage, referred to as a secondary flow path, surrounding the primary flow path are formed from the splitter nose, and the turbine engine further comprises:

[0013] - a stationary housing comprising arms extending radially relative to the longitudinal axis in the secondary flow path,

[0014] a first shaft, called the low-pressure shaft, designed to rotate relative to the housing about a longitudinal axis oriented in the axial direction of the air flow,

[0015] a second shaft, called the high-pressure shaft, designed to rotate about the low-pressure shaft relative to the housing, the high-pressure shaft and the low-pressure shaft being concentric,

[0016] at least one accessory designed to be driven by an electric motor powered by electrical energy,

[0017] - an upper part, by means of which the turbine engine is intended to be attached to the aircraft,

[0018] - an opposite lower portion in a vertical direction orthogonal to the longitudinal axis, in which lower portion the arms extend substantially vertically in the secondary flow path,

[0019] a first intermediate shaft designed to receive mechanical power from the low-pressure shaft,

[0020] a second intermediate shaft designed to receive mechanical power from the high-pressure shaft,

[0021] - an electric generator assembly housed in the arm, the generator assembly being coupled to the first intermediate shaft on the one hand and to the second intermediate shaft on the other hand so as to receive mechanical power from the first intermediate shaft on the one hand and from the second intermediate shaft on the other hand, the generator assembly being further designed to convert the mechanical power received from the first and second intermediate shafts into electrical energy in order to power the electric motor driving one or more accessories, the electrical energy for powering the electric motor driving the one or more accessories coming simultaneously from the mechanical power obtained from the low-voltage shaft and from the mechanical power obtained from the high-voltage shaft.

[0022] According to variant embodiments which may be considered together or individually:

[0023] - the first intermediate shaft and the second intermediate shaft are coaxial, each of the first intermediate shaft and the second intermediate shaft being designed to rotate independently of each other about the same intermediate axis relative to the housing;

[0024] - the secondary flow path is defined radially relative to the longitudinal axis by an outer shroud and an inner hub of the housing, the outer shroud and the hub being concentric and centered on the longitudinal axis;

[0025] - the arm housing the generator assembly extends radially relative to the longitudinal axis between the outer shroud and the hub;

[0026] - the arm accommodates the auxiliary component upstream in the axial direction of the air flow and accommodates the generator assembly downstream in the axial direction of the air flow;

[0027] -The generator assembly comprises:

[0028] a first drive shaft, the first drive shaft being designed to receive mechanical power from the first intermediate shaft and to rotate relative to the housing about a first drive axis,

[0029] a second drive shaft, the second drive shaft being designed to receive mechanical power from the second intermediate shaft and to rotate relative to the housing about a second drive axis, the first drive shaft and the second drive shaft being coaxial, and each of the first drive shaft and the second drive shaft being designed to rotate about the first drive axis and the second drive axis in opposite directions, the first drive axis and the second drive axis being coincident,

[0030] one or more first alternators, each of the one or more first alternators including an inductor-type rotor mounted and fixed for rotation with one of the first and second drive shafts about the first and second drive axes, and an induction rotor mounted and fixed for rotation with the other of the first and second drive shafts about the first and second drive axes,

[0031] one or more second AC generators, each of the one or more second AC generators including an inductor rotor and an inductor stator, the inductor rotor being mounted and fixed for rotation about the first and second drive axes together with one of the first and second drive shafts that is surrounded by the other of the first and second drive shafts, the inductor stator being fixed relative to the inductor rotor of the second AC generator;

[0032] - the first and second drive axes are oriented substantially in the axial direction of the air flow;

[0033] -The generator assembly comprises:

[0034] a third drive shaft, the third drive shaft being designed to receive mechanical power from the first drive shaft and to rotate relative to the housing about a third drive axis,

[0035] a fourth drive shaft, the fourth drive shaft being designed to receive mechanical power from the second drive shaft and to rotate relative to the housing about a fourth drive axis, the third drive shaft and the fourth drive shaft being coaxial, each of the third drive shaft and the fourth drive shaft being designed to rotate in opposite directions about the third drive axis and the fourth drive axis, and the third drive axis and the fourth drive axis being coincident,

[0036] one or more third AC generators, each of the one or more third AC generators including an inductor-type rotor mounted and fixed for rotation with one of the third and fourth drive shafts about the third and fourth drive axes, and an induction rotor mounted and fixed for rotation with the other of the third and fourth drive shafts about the third and fourth drive axes,

[0037] one or more fourth AC generators, each of the one or more fourth AC generators including an inductor rotor and an inductor stator, the inductor rotor being mounted and fixed for rotation about the third and fourth drive axes together with a drive shaft of the third and fourth drive shafts that is surrounded by the other of the third and fourth drive shafts, the inductor stator being fixed relative to the inductor rotor of the fourth AC generator;

[0038] - the longitudinal axis and the first, second, third and fourth drive axes are comprised in the same plane;

[0039] - the third drive shaft and the fourth drive shaft are parallel to the first drive shaft and the second drive shaft respectively;

[0040] - the first and second drive shafts are oriented substantially in the axial direction of the air flow, the third and fourth drive shafts are located radially outside relative to the longitudinal axis, and the first and second drive shafts are located radially inside;

[0041] - the first alternator is located upstream along the axial direction of the airflow, and the second alternator is located downstream along the axial direction of the airflow;

[0042] or

[0043] - the first alternator and the third alternator are located upstream in the axial direction of the airflow, and the second alternator and the fourth alternator are located downstream in the axial direction of the airflow;

[0044] - the first and second alternators are housed in first and second housings, respectively, the first and second housings themselves being housed in the arm, the first housing having a transverse dimension taken along a transverse direction perpendicular to the axial dimension of the air flow, the transverse direction being substantially horizontal, the transverse dimension of the first housing being greater than the transverse dimension of the second housing;

[0045] and / or

[0046] - a third alternator and a fourth alternator are housed in the first or third housing, respectively, housed in the arm, and in the second or fourth housing, respectively, housed in the arm, the third housing having a transverse dimension taken along a transverse direction perpendicular to the axial dimension of the air flow, the transverse direction being substantially horizontal, the transverse dimension of the third housing being greater than the transverse dimension of the fourth housing;

[0047] - the first housing and / or the third housing are arranged in contact with the wall of the arm;

[0048] -The generator assembly comprises:

[0049] an inner drive shaft, the inner drive shaft being designed to rotate relative to the housing about a drive axis and obtaining mechanical power from the first intermediate shaft or the second intermediate shaft,

[0050] an outer drive shaft designed to rotate in an opposite direction of rotation relative to the housing about the inner drive shaft and to obtain mechanical power from the second intermediate shaft or the first intermediate shaft, the inner drive shaft and the outer drive shaft being concentric,

[0051] one or more alternators, each of the one or more alternators comprising an inductor-type or inductive inner body and an inductive or inductive outer body, the inner body being mounted and fixed for rotation with an inner drive shaft about a drive axis, the outer body being mounted and fixed for rotation with an outer drive shaft about a drive axis, the outer body being positioned facing the inner body;

[0052] - the drive axis is oriented substantially radially relative to the longitudinal axis;

[0053] or

[0054] - the drive axis is oriented substantially in the axial direction of the air flow;

[0055] - the turbine engine also includes a regulation system through which the generator assembly delivers electrical energy to one or more accessories;

[0056] - the secondary flow path is separated from the primary flow path by a flow path compartment, the one or more accessories being accommodated in the flow path compartment;

[0057] - the one or more accessories are selected from:

[0058] Oil pump,

[0059] Fuel pump,

[0060] Hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Other aspects, objects, advantages and features of the present invention will better emerge on reading the following detailed description of a preferred embodiment given by way of non-limiting example and made with reference to the accompanying drawings, in which:

[0062] - Figure 1 is a schematic longitudinal sectional view of a double bypass turbine engine according to a first embodiment of the present invention;

[0063] - Figure 2 is a schematic longitudinal sectional view of a twin-bypass turbine engine according to a second embodiment of the present invention;

[0064] - Figure 3 is a schematic longitudinal sectional view of a twin-bypass turbine engine according to a third embodiment of the present invention;

[0065] - Figure 4 yes Figure 1 Schematic diagram of a tangential section of an arm of a turbine engine shown in . DETAILED DESCRIPTION

[0066] Figures 1 to 3 A double ducted turbine engine 100A, 100B, 100C of an aircraft according to a first, second and third embodiment of the invention is shown, respectively. Components common to these three embodiments of the invention have the same reference numerals.

[0067] An axial direction, a radial direction orthogonal to the axial direction, and a circumferential direction orthogonal to the axial and radial directions are preliminarily defined.

[0068] In the remainder of the description, the terms "upstream" and "downstream" are used with reference to the axial direction of the gas flow.

[0069] A vertical direction is also defined, which is orthogonal to the longitudinal direction and is oriented from bottom to top.

[0070] From upstream to downstream, turbine engines 100A, 100B, and 100C include an air inlet 101, a fan 102, and a splitter nose 103. Splitter nose 103 generates an annular primary airflow flow passage 104 and a secondary airflow flow passage 106. The primary airflow flow passage is referred to as a primary flow path and is formed within the core of turbine engines 100A, 100B, and 100C, which extends along an axially oriented longitudinal axis 105. The secondary airflow flow passage surrounds primary flow path 104 and is separated from the primary flow path 104 by a flow path compartment 107. The secondary airflow flow passage is referred to as a secondary flow path. Both primary flow path 104 and secondary flow path 106 are centered on longitudinal axis 105.

[0071] The turbine engines 100A, 100B, 100C are further streamlined by a nacelle 108 fixed to the aircraft at its upper portion, surrounding the secondary flow path 106. In particular, the nacelle 108 comprises a fan casing 109 surrounding the fan 102 and defining an air inlet 101 upstream of the fan 102.

[0072] Primary flow path 104 itself includes, from upstream to downstream, a low-pressure compressor 110, a high-pressure compressor 111, a combustor 112, a high-pressure turbine 113, a low-pressure turbine 114, and an exhaust nozzle 115. Secondary flow path 106 includes a fan straightener 116, also known as an "outlet guide vane" ("OGV").

[0073] The turbine engine 100A, 100B, 100C also comprises a stationary casing 117, 118, 121 which itself comprises an outer shroud 117 and an inner hub 118 situated downstream of the splitter nose 103. The outer shroud 117 and the hub 118 are concentric and centred on the longitudinal axis 105.

[0074] The hub 118 includes an outer annular wall 119 that, together with the outer shroud 117, defines the secondary flow path 106, and an inner annular wall 120 that defines the primary flow path 104. Thus, the outer shroud 117 surrounds the secondary flow path 106, and the secondary flow path 106 surrounds the hub 118. The hub 118 itself surrounds the primary flow path 104.

[0075] Thus, the outer shroud 117 partially forms the nacelle 108. For example, the outer shroud is located downstream of the fan case 109.

[0076] The outer annular wall 119 and the inner annular wall 120 also together define the flow path compartment 107 .

[0077] The housing further includes a plurality of arms 121 extending radially relative to the longitudinal axis 105 between the outer shroud 117 and the hub 118 , particularly the outer annular wall 119 of the hub 118 , and evenly distributed about the longitudinal axis 105 .

[0078] One of the arms 121 is located at 6 o'clock, for example, similar to the dial of a clock. In other words, this arm 121 is located in the lower part of the turbine engine 100A, 100B, 100C and extends radially and vertically between the outer shroud 117 and the hub 118.

[0079] For example, the arms 121 themselves form blades of the fan rectifier 116. Alternatively (not shown), the arms 121 are located downstream of the fan rectifier 116.

[0080] The arm 121 may accommodate auxiliary components (not shown) such as catheters, tubing, electrical harnesses, and the like.

[0081] Turbine engines 100A, 100B, 100C further include a first shaft 122, designated as a low-pressure shaft, designed to rotate relative to casing 117, 118, 121 about longitudinal axis 105, and a second shaft 123, designated as a high-pressure shaft, designed to rotate relative to casing 117, 118, 121 about low-pressure shaft 122. Low-pressure shaft 122 and high-pressure shaft 123 are concentric.

[0082] Both the low-pressure shaft 122 and the high-pressure shaft 123 are part of the core of the turbine engine 100 .

[0083] For example, the low-pressure shaft 122 connects the low-pressure compressor 110 and the low-pressure turbine 114 , and the high-pressure shaft 123 connects the high-pressure compressor 111 and the high-pressure turbine 113 .

[0084] Low-pressure shaft 122 also drives fan 102 to rotate relative to housings 117, 118, 121 about longitudinal axis 105, for example via reduction gear 124. Thus, fan 102 is indirectly driven by low-pressure shaft 122. Alternatively (not shown), fan 102 may be directly driven by low-pressure shaft 122.

[0085] The low-pressure shaft 122 and the high-pressure shaft 123 are designed, for example, to rotate in the same direction of rotation about the longitudinal axis 105. This is particularly the case for the low-pressure shaft 122 and the high-pressure shaft 123 of the turbine engine 100C of the third embodiment ( Figure 3 Alternatively, the low-pressure shaft 122 and the high-pressure shaft 123 are designed to rotate about the longitudinal axis 105 in opposite rotational directions.

[0086] The turbine engines 100A, 100B, 100C are also equipped with one or more accessories or devices, such as an oil pump 125, a fuel pump 126 or even a hydraulic pump. Of course, this list is not exhaustive.

[0087] The oil pump 125 is designed, for example, to deliver oil from an oil reservoir (not shown) to the reduction gear 124 and / or to bearings (not shown) that support the low-pressure shaft 122 and the high-pressure shaft 123 and are carried by the casings 117, 118, 121. The oil pump 125 thus ensures lubrication and cooling of the reduction gear 124 and / or the bearings, and therefore cooling of the turbine engines 100A, 100B, 100C.

[0088] The fuel pump 126 is designed, for example, to deliver fuel to the combustion chamber 112 for combusting the gas in the combustion chamber 112 .

[0089] One or more accessories 125, 126 are also designed to be mechanically driven by an electric motor (not shown) powered by electrical energy. Thus, the motor is designed to drive a movable part of the accessory 125, 126, such as a rotating part, such as a pump rotor. The motor can be integrated into the accessory 125, 126, so that the motor and the motor-driven accessory 125, 126 form a one-piece assembly. Alternatively, the motor can be independent of or even separate from the one or more accessories 125, 126 it drives.

[0090] The accessories 125, 126 are housed, for example, in the flow path compartment 107. Alternatively (not shown), the accessories 125, 126 are housed in the nacelle 108. Still alternatively (not shown), a portion of the accessories 125, 126 is housed in the flow path compartment 107 and another portion of the accessories 125, 126 is housed in the nacelle 108.

[0091] According to the invention, the turbine engines 100A, 100B, 100C further comprise a first intermediate shaft 127 designed to obtain mechanical power from the low-pressure shaft 122, a second intermediate shaft 128 designed to obtain mechanical power from the high-pressure shaft 123, and an electrical generator assembly 129, which is coupled to the first intermediate shaft 127 on the one hand and to the second intermediate shaft 128 on the other hand, so as to receive mechanical power from the first intermediate shaft 127 on the one hand and from the second intermediate shaft 128 on the other hand.

[0092] The generator assembly 129 is also designed to convert mechanical power received from the first and second intermediate shafts 127 and 128 into electrical energy and use the electrical energy to power electric motors that drive one or more accessories 125 , 126 , such as the oil pump 125 and / or the fuel pump 126 .

[0093] In this manner, the electrical energy supplied to the one or more accessories 125 , 126 via the electric motor driving the one or more accessories 125 , 126 comes from both the mechanical power derived from the low pressure shaft 122 and the mechanical power derived from the high pressure shaft 123 .

[0094] Thus, during the "windmilling" phase of turbine engines 100A, 100B, 100C corresponding to the automatic selection of fan 102, even if high-pressure shaft 123 rotates slower than low-pressure shaft 122, the total mechanical power obtained from low-pressure shaft 122 and high-pressure shaft 123 is sufficient to provide electrical energy to one or more accessories by driving the electric motors of one or more accessories 125, 126. This ensures, in particular, that the oil pump 125 delivers the oil required for lubricating and cooling the reduction gear 124, which, due to the automatic rotation of fan 102, is deflected and would be at risk of damage or even rupture.

[0095] Therefore, depending on the operating phase of the turbine engine 100A, 100B, 100C, the generator assembly 129 can also receive mechanical power only from the low-pressure shaft 122, only from the high-pressure shaft 123, or from both the low-pressure shaft 122 and the high-pressure shaft 123. Thus, the generator assembly 129 can operate at either the speed of the low-pressure shaft 122, the speed of the high-pressure shaft 123, or a mixture of the two speeds.

[0096] Thus, the generator assembly 129 replaces a transmission gearbox, also known as an accessory gearbox or "AGB," which is known to be implemented to mechanically drive one or more accessories 125, 126 by deriving mechanical power from the high-pressure shaft 123. This makes it possible, in particular, to reduce lubrication requirements and, therefore, the volume of the oil reservoir. The generator assembly 129 can also be electrically driven and controlled to operate in motor mode, advantageously replacing the starter that typically mechanically drives the high-pressure shaft via such a transmission gearbox.

[0097] The generator assembly 129 is particularly supported by the intermediate housings 117 , 118 , 121 .

[0098] The first intermediate shaft 127 and the second intermediate shaft 128 are, for example, coaxial and are each designed to rotate independently of each other about the intermediate axis 130 relative to the housing 117, 118, 121. Thus, the first intermediate shaft 127 or the second intermediate shaft 128 rotates around the second intermediate shaft 128 or the first intermediate shaft 127. Figures 1 to 3 In the example shown, the first intermediate shaft 127 surrounds the second intermediate shaft 128 .

[0099] Alternatively, the first intermediate shaft 127 and the second intermediate shaft 128 are arranged parallel to each other and are also axially offset relative to each other in the same plane including the longitudinal axis 105. According to this variant, each of the first intermediate shaft 127 and the second intermediate shaft 128 is therefore designed to rotate relative to the housing 117, 118, 121 about an intermediate axis 130 specific to the first and second intermediate shafts.

[0100] The first intermediate shaft 127 and the second intermediate shaft 128 are designed, for example, to rotate in opposite rotational directions relative to each other about the intermediate axis 130 relative to the housing 117, 118, 121. Alternatively, the first intermediate shaft 127 and the second intermediate shaft 128 are designed to rotate in the same rotational direction relative to the housing 117, 118, 121 about the intermediate axis 130.

[0101] The first and second intermediate shafts 127 , 128 each extend along an intermediate axis 130 between a first end 127 a , 128 a and an opposing second end 127 b , 128 b .

[0102] The first end 127 a , 128 a of each of the first intermediate shaft 127 and the second intermediate shaft 128 is designed to receive mechanical power from the low-pressure shaft 122 or the high-pressure shaft 123 .

[0103] To this end, the first end 127a, 128a of each of the first and second intermediate shafts 127, 128 carries, for example, a first gear 127c, 128c fixed for rotation together with the first and second intermediate shafts 127, 128, respectively, about the intermediate axis 130. The first gears 127c, 128c of the first and second intermediate shafts 127, 128 also mesh with gears 122a, 123a, themselves carried by the low-pressure shaft 122, respectively, or the high-pressure shaft 123, and mounted fixed thereon for rotation together with the low-pressure shaft 122, respectively, or the high-pressure shaft 123, about the longitudinal axis 105.

[0104] The first gears 127 c and 128 c of the first intermediate shaft 127 and the second intermediate shaft 128 and the gears 122 a and 123 a of the low-pressure shaft 122 and the high-pressure shaft 123 are, for example, gears with bevel teeth.

[0105] The first ends 127a, 128a of each of the first intermediate shaft 127 and the second intermediate shaft 128 are, for example, axially located between the gears 122a, 123a of the low-pressure shaft 122 and the high-pressure shaft 123. Therefore, when the low-pressure shaft 122 and the high-pressure shaft 123 rotate in the same rotational direction, the first intermediate shaft 127 and the second intermediate shaft 128 rotate in opposite rotational directions.

[0106] Alternatively, the first end 127a, 128a of each of the first intermediate shaft 127 and the second intermediate shaft 128 is axially located only on one side of the gears 122a, 123a of the low-pressure shaft 122 and the high-pressure shaft 123. Therefore, when the low-pressure shaft 122 and the high-pressure shaft 123 rotate in opposite rotational directions, the first intermediate shaft 127 and the second intermediate shaft 128 themselves rotate in opposite rotational directions.

[0107] The second ends 127 b , 128 b of the first and second intermediate shafts 127 , 128 are designed to transmit mechanical power to the generator assembly 129 independently of each other.

[0108] The generator assembly 129 is housed in, for example, one of the arms 121. In this manner, the generator assembly 129 is cooled by the air flow, referred to as the secondary flow, circulating in the secondary flow path 106.

[0109] The generator assembly 129 is housed in particular in the arm 121 located at the 6 o'clock position. This prevents the increase in the mass of the arm 121 from disturbing the static equilibrium of the turbine engine 100A, 100B, 100C by generating a gravitational moment relative to the longitudinal axis 105, which would tend to cause the turbine engine 100A, 100B, 100C to rotate.

[0110] To this end, first and second intermediate shafts 127, 128 extend, for example, from the core of turbine engine 100A, 100B, 100C through primary flow path 104 and flow path compartment 107 to arm 121, which passes through secondary flow path 106 and houses generator assembly 129. Thus, first ends 127a, 128a of first and second intermediate shafts 127, 128 are located in the core of turbine engine 100A, 100B, 100C, while second ends 127b, 128b of first and second intermediate shafts are located in arm 121, which houses generator assembly 129.

[0111] The first and second intermediate shafts 127 and 128 are themselves housed, for example, in an arm (not shown) extending from the core of the turbine engine 100A, 100B, 100C to the hub 118, in particular the annular inner wall 120 of the hub 118. This arm is arranged axially between the low-pressure compressor 110 and the high-pressure compressor 111.

[0112] The generator assembly 129 is, for example, arranged axially downstream of the auxiliary member, which is also housed in the arm 121. Thus, the arm 121 housing the generator assembly 129 extends axially downstream in the secondary flow path 106. The region of the secondary flow path 106 in which the arm 121 extends is referred to as a "bifurcation zone."

[0113] A fire wall partition is for example provided between the generator assembly 129 and the flow path compartment 107 , in particular at the outer annular wall 119 of the hub 118 , to limit the risk of fire and heat transfer from the arm 121 housing the generator assembly 129 to the flow path compartment 107 .

[0114] according to Figure 1 In the illustrated first embodiment, the generator assembly 129 of the turbine engine 100A includes a first drive shaft 131 , one or more first alternators 132 , a second drive shaft 133 , and one or more second alternators 134 .

[0115] The first drive shaft 131 is designed to receive mechanical power from the first intermediate shaft 127 and rotate relative to the housings 117 , 118 , 121 around a first drive axis 135 .

[0116] The second drive shaft 133 is designed to receive mechanical power from the second intermediate shaft 128 and rotate relative to the housings 117 , 118 , 121 around a second drive axis 136 .

[0117] The first drive shaft 131 and the second drive shaft 133 are coaxial, and each of the first drive shaft and the second drive shaft is designed to rotate independently of each other in opposite rotational directions around the coinciding first drive axis 135 and the second drive axis 136. Therefore, the first drive shaft 131 or the second drive shaft 133 rotates around the second drive shaft 133 or the first drive shaft 131. The first drive shaft 131 and the second drive shaft 133 are concentric. The first drive shaft and the second drive shaft also rotate in opposite directions. Figure 1 In the example shown, first drive shaft 131 surrounds second drive shaft 133. Consequently, for the same amount of power generated, generator assembly 129 is smaller. This also allows for limiting the main cross-section of arm 121, taken transversely to longitudinal axis 105, i.e., the maximum cross-section of arm 121. When first drive shaft 131 surrounds second drive shaft 133, performance during the "windmilling" phase is improved.

[0118] Each of the first AC generators 132 includes an inductor rotor mounted and fixed so as to rotate together with one of the first drive shaft 131 and the second drive shaft 133, and an induction rotor mounted and fixed so as to rotate together with the other of the first drive shaft 131 and the second drive shaft 133 and positioned facing the inductor rotor. For example, the first AC generators 132 are evenly distributed along the first drive shaft 131 and the second drive shaft 133.

[0119] In this way, relative rotation of the inductor-type rotor of the or each first alternator 132 relative to the induction rotor of said first alternator 132 produces a change in electromagnetic flux which induces an alternating current in the induction rotor.

[0120] Furthermore, the inductor-type rotor and the induction rotor of the or each first alternator 132 are capable of rotating in opposite directions of rotation relative to one another and the generator assembly 129 enables more electrical power to be generated.

[0121] The inductor-type rotor of the or each first alternator 132 comprises at least one permanent magnet or at least one electromagnet, for example formed by a winding powered by direct current, whereas the induction rotor of the or each first alternator 132 comprises at least one winding.

[0122] Each of the second AC generators 134 includes an inductor rotor and an inductor stator. The inductor rotor is mounted and fixed for rotation with one of the first and second drive shafts 131, 133, which is surrounded by the other drive shaft 131, 133, here, second drive shaft 133. The inductor stator is fixed relative to the housing 117, 118, 121 and, therefore, also relative to the inductor rotor. The second AC generators 134 are, for example, evenly distributed along the second drive shaft 133.

[0123] In this way, rotation of the inductor-type rotor of the or each second alternator 134 relative to the fixed induction stator of said second alternator 134 produces a variation in electromagnetic flux which induces an alternating current in the induction stator.

[0124] The fact of multiplying the first alternator 132 and / or the second alternator 134 also makes it possible to minimize the heating of the generator assembly 129 , thereby not forcing the implementation of a cooling system specifically dedicated to the generator assembly 129 .

[0125] The inductor-type rotor of the or each second alternator 134 comprises, for example, at least one permanent magnet. Alternatively, the inductor-type rotor of the or each second alternator 134 comprises at least one electromagnet formed by a winding powered by direct current.

[0126] The inductive stator of the or each second alternator 134 comprises, for example, at least one winding.

[0127] The first and second drive shafts 131 , 133 each extend along coincident first and second drive axes 135 , 136 between a first end 131 a , 133 a and an opposing second end 131 b , 133 b .

[0128] The first AC generator 132 and the second AC generator 134 are arranged on opposite sides of one of the first drive shaft 131 and the second drive shaft 133, for example, along the first drive axis 135 and the second drive axis 136, and one of the first drive shaft and the second drive shaft is surrounded by the other of the first drive shaft 131 and the second drive shaft 133. The first AC generator 132 is arranged on one side of the first end 131a, 133a of the first drive shaft 131 and the second drive shaft 133, for example, which is surrounded by the other of the first drive shaft 131 and the second drive shaft 133, while the second AC generator 134 is arranged on one side of the second end 131b, 133b of the first drive shaft 131 or the second drive shaft 133. Figure 1In the embodiment, the first AC generator 132 is arranged on one side of the first end 133 a of the second drive shaft 133 , and the second AC generator 134 is arranged on one side of the second end 133 b of the second drive shaft 133 .

[0129] The first end 131 a , 133 a of each of the first and second drive shafts 131 and 133 is designed to receive mechanical power from the first intermediate shaft 127 or the second intermediate shaft 128 .

[0130] To this end, the first end 131a, 133a of each of the first and second drive shafts 131, 133 carries, for example, a first gear wheel 131c, 133c, which is fixed so as to rotate together with the first and second drive shafts 131, 133 about a first and second drive axis 135, 136. The first gear wheels 131c, 133c of the first and second drive shafts 131, 133 also mesh with a second gear wheel 127d, 128d, which is itself carried by the second end 127b, 128b of the first and second intermediate shafts 127, 128, and which is mounted so as to be fixed on the first and second intermediate shafts 127, 128 so as to rotate together with the first and second intermediate shafts 127, 128 about the intermediate axis 130.

[0131] The first gears 131 c and 133 c of the first and second drive shafts 131 and 133 and the second gears 127 d and 128 d of the first and second intermediate shafts 127 and 128 are, for example, gears with bevel teeth.

[0132] When the first intermediate shaft 127 and the second intermediate shaft 128 are designed to rotate in the same rotation direction, for example, additional pinions are provided to transmit mechanical power between the first intermediate shaft 127 and the gears 127d, 131c of the first drive shaft 131, or to transmit mechanical power between the second intermediate shaft 128 and the gears 128d, 133c of the second drive shaft 133 so as to reverse the rotation directions of the first drive shaft 131 and the second drive shaft 133.

[0133] The first and second drive axes 135, 136, which coincide, are, for example, coplanar with the longitudinal axis 105 and / or the intermediate axes 130 of the first and second intermediate shafts 127, 128. This plane common to the axes under consideration may correspond to the plane of symmetry of the bifurcation formed by the arms 121. This plane may be vertical or inclined relative to the vertical.

[0134] The first drive axis 135 and the second drive axis 136 are, for example, oriented generally axially. The first drive axis and the second drive axis are, for example, substantially parallel to the longitudinal axis 105. The axial orientation of the first drive axis 135 and the second drive axis 136 is intended to facilitate axial extension of the arm 121 that accommodates the generator assembly 129 at the bifurcation region, rather than increasing the height of the secondary flow path 106. The "height" of the secondary flow path 106 refers to the radial dimension of the secondary flow path 106. In other words, the height of the secondary flow path 106 corresponds to the distance between the outer shroud 117 and the outer annular wall 119 of the hub 118, taken radially relative to the longitudinal axis 105. This makes it possible to further limit the main cross-section of the arm 121.

[0135] The first ends 131a and 133a of the first and second drive shafts 131 and 133 are located upstream, while the second ends 131b and 133b of the first and second drive shafts 131 and 133 are located downstream. This makes it possible to limit the dimensions of the first and second intermediate shafts 127 and 128 along the intermediate axis 130.

[0136] The first alternator 132 is located upstream, for example, while the second alternator 134 is located downstream.

[0137] The first and second alternators 132, 134 may be housed in first and second housings 150, 151, respectively, which themselves are housed in the arm 121 ( Figure 4 ). The first housing 150 also has a transverse dimension D1, taken in a transverse direction perpendicular to the axial dimension of the airflow (substantially horizontal), which is greater than the transverse dimension D2 of the second housing 151. In this way, by installing the first alternator 132 larger than the second alternator 134, it is possible to take advantage of the aerodynamic profile of the shaft 121, which is wider upstream than downstream in the axial direction of the airflow in a cross section taken tangentially relative to the longitudinal axis 105.

[0138] The first housing 150 can also be arranged in contact with the wall 152 of the arm 121, in particular approximately tangentially with respect to the longitudinal axis 105, or even flush with the wall 152 of the arm 121, in order to improve the cooling effect of the first alternator 132 by the secondary flow circulating in the secondary flow path 106. The first housing 150 is in contact with the wall 152, for example via a layer of heat-conducting material suitable for preventing friction wear of the wall 152 and the first housing 150 and / or for damping vibrations, such as a silicone elastomer. The contact area between the first housing 150 and the wall 152 of the arm 121 is Figure 4 Indicated by 153.

[0139] Alternatively (not shown), the first and second drive axes 135, 136 are oriented generally radially relative to the longitudinal axis 105. The radial orientation of the first and second drive axes 135, 136 is intended to facilitate an increase in the height of the secondary flow path 106, rather than an axial extension of the arm 121 at the bifurcation region to accommodate the generator assembly 129. This further enables the primary cross-section of the arm 121 to be limited.

[0140] For example, first ends 131a, 133a of first drive shaft 131 and second drive shaft 133 are located radially inward relative to longitudinal axis 105, while second ends 131b, 133b of first drive shaft 131 and second drive shaft 133 are located radially outward. This makes it possible to limit the dimensions of first intermediate shaft 127 and second intermediate shaft 128 along intermediate axis 130.

[0141] Alternatively (not shown), the first and second drive axes 135 and 136 are inclined in both the axial and radial directions. This enables a compromise to be achieved between the increase in height of the secondary flow path 106 and the axial extension of the arm 121 accommodating the generator assembly 129 at the bifurcation region.

[0142] according to Figure 2 In the second embodiment shown, in addition to the first and second drive shafts 131 and 133 and the first and second AC generators 132 and 134 , the generator assembly 129 of the turbine engine 100B also includes a third drive shaft 137 , one or more third AC generators 138 , a fourth drive shaft 139 and one or more fourth AC generators 140 .

[0143] The third drive shaft 137 is designed to receive mechanical power from the first drive shaft 131 and rotate relative to the housings 117 , 118 , 121 around a third drive axis 141 .

[0144] The fourth drive shaft 139 is designed to receive mechanical power from the second drive shaft 133 and rotate relative to the housings 117 , 118 , 121 around a fourth drive axis 142 .

[0145] The third drive shaft 137 and the fourth drive shaft 139 are coaxial, and each of the third drive shaft and the fourth drive shaft is designed to rotate independently of each other in opposite rotational directions about the coincident third drive axis 141 and the fourth drive axis 142. The third drive shaft 137 or the fourth drive shaft 139 thus rotates about the fourth drive axis 139 or the third drive shaft 137. The third drive shaft 137 and the fourth drive shaft 139 are concentric. The third drive shaft and the fourth drive shaft also rotate in opposite directions. Figure 2In the example shown, third drive shaft 137 surrounds fourth drive shaft 139. Consequently, for the same amount of power generated, generator assembly 129 is smaller. This also allows for limiting the main cross-section of arm 121. When third drive shaft 137 surrounds fourth drive shaft 139, performance during the "windmilling" phase is improved.

[0146] Each of the third AC generators 138 includes an inductor rotor mounted and fixed so as to rotate together with one of the third drive shaft 137 and the fourth drive shaft 139, and an induction rotor mounted and fixed so as to rotate together with the other of the third drive shaft 137 and the fourth drive shaft 139 and positioned facing the inductor rotor. For example, the third AC generators 138 are evenly distributed along the third drive shaft 137 and the fourth drive shaft 139.

[0147] In this way, relative rotation of the inductor-type rotor of the or each third alternator 138 relative to the induction rotor of said third alternator 138 produces a change in electromagnetic flux which induces an alternating current in the induction rotor.

[0148] Furthermore, the inductor-type rotor and the induction rotor of the or each third alternator 138 are capable of rotating in opposite directions of rotation relative to one another, the generator assembly 129 enabling even more electrical power to be generated.

[0149] The inductor-type rotor of the or each third alternator 138 comprises at least one permanent magnet or at least one electromagnet, for example formed by a winding powered by direct current, whereas the induction rotor of the or each third alternator 138 comprises at least one winding.

[0150] Each of fourth AC generators 140 includes an inductor rotor and an inductor stator. The inductor rotor is mounted and fixed for rotation with the other of third and fourth drive shafts 137, 139, which is surrounded by the other drive shaft, here, fourth drive shaft 139. The inductor stator is fixed relative to housings 117, 118, 121 and, therefore, relative to the inductor rotor. Fourth AC generators 140 are, for example, evenly distributed along fourth drive shaft 139.

[0151] In this way, rotation of the inductor-type rotor of the or each fourth alternator 140 relative to the fixed induction stator of said fourth alternator 140 produces a variation in electromagnetic flux which induces an alternating current in the induction stator.

[0152] The addition of third and fourth drive shafts 137 and 139 and third and fourth alternators 138 and 140 enables an increase in the electrical power generated by generator assembly 129 .

[0153] The inductor-type rotor of the or each fourth alternator 140 comprises, for example, at least one permanent magnet. Alternatively, the inductor-type rotor of the or each fourth alternator 138 , 140 comprises at least one electromagnet formed by a winding powered by direct current.

[0154] The induction stator of the or each fourth alternator 138 , 140 comprises, for example, at least one winding.

[0155] The third and fourth drive shafts 137, 139 each extend along a third or fourth drive axis 141, 142 between a first end 137a, 139a and an opposing second end 137b, 139b, with the third and fourth drive axes coinciding.

[0156] The third AC generator 138 and the fourth AC generator 140 are arranged, for example, along the third drive axis 141 and the fourth drive axis 142 on opposite sides of one of the third drive shaft 137 and the fourth drive shaft 139, and one of the third drive shaft and the fourth drive shaft is surrounded by the other of the third drive shaft 138 and the fourth drive shaft 140. The third AC generator 138 is arranged, for example, on one side of the first end 137a, 139a of the third drive shaft 137 and the fourth drive shaft 139, which is surrounded by the other of the third drive shaft 137 and the fourth drive shaft 139, while the fourth AC generator 140 is arranged on one side of the second end 137b, 139b of the third drive shaft 137 and the fourth drive shaft 139. Figure 1 , the third AC generator 138 is arranged on one side of the first end 137 a of the third drive shaft 137 , and the fourth AC generator 140 is arranged on one side of the second end 139 b of the fourth drive shaft 139 .

[0157] The first end 137 a , 139 a of each of the third drive shaft 137 and the fourth drive shaft 139 is designed to receive mechanical power from the first drive shaft 131 or the second drive shaft 133 .

[0158] To this end, the first end 137a, 139a of each of the third and fourth drive shafts 137, 139 carries, for example, a first gear 137c, 139c fixed for rotation together with the third and fourth drive shafts 137, 139 about the third and fourth drive axes 141, 142. The first gears 137c, 139c of the third and fourth drive shafts 137, 139 also mesh with first gears 131c, 133c of the first and second drive shafts 131, 133, or with second gears 133d, which are themselves carried by the first and second drive shafts 131, 133 and are mounted fixed on the first and second drive shafts 131, 133 for rotation together with the first and second drive shafts about the first and second drive axes 135, 136.

[0159] exist Figure 2 In the example shown, the first gear 137 c of the third drive shaft 137 meshes with the first gear 131 c of the first drive shaft 131 , and the first gear 139 c of the fourth drive shaft 139 meshes with the second gear 133 d of the second drive shaft 133 .

[0160] The first gears 137c, 139c of the third drive shaft 137 and the fourth drive shaft 139, which engage with the first gears 131c, 133c of the first drive shaft 131 or the second drive shaft 133, are gears with bevel teeth, as appropriate.

[0161] Where appropriate, the second gear 133d of the first drive shaft 131 or the second drive shaft 133 is, for example, a spur gear. The first gears 137c, 139c of the first drive shaft 131 and the second drive shaft 133 engaged with the second gear 133d of the first drive shaft 131 or the second drive shaft 133 are themselves spur gears.

[0162] The longitudinal axis 105 and the first, second, third, and fourth drive axes 135, 136, 141, 142 are for example comprised in the same plane. This makes it possible, for example, to utilize the entire height of the secondary flow path 106 without increasing the main cross section of the arm 121.

[0163] exist Figure 2 In the example shown, the mutually parallel first, second, third, and fourth drive axes 135 , 136 , 141 , 142 are, for example, coplanar with the longitudinal axis 105 and / or the intermediate axis 130 of the first and second intermediate shafts 127 , 128 .

[0164] The third drive axis 141 and the fourth drive axis 142 are, for example, parallel to the first drive axis 135 and the second drive axis 136 , respectively.

[0165] The third drive axis 141 and the fourth drive axis 142 are, for example, oriented substantially axially. The third drive axis and the fourth drive axis are substantially parallel to the longitudinal axis 105.

[0166] The first ends 137a, 139a of the third and fourth drive shafts 137, 139 are located upstream, while the second ends 137b, 139b of the third and fourth drive shafts 137, 139 are located downstream. This makes it possible to limit the dimensions of the first and second intermediate shafts 127, 128 along the intermediate axis 130.

[0167] The third alternator 138 is located upstream, for example, while the fourth alternator 140 is located downstream.

[0168] The third alternator 138 and the fourth alternator 140 may be housed in a first housing 150 or a third housing itself housed in the arm 121 and a second housing 151 or a fourth housing itself housed in the arm 121 , respectively.

[0169] Where appropriate, the third housing has a transverse dimension, taken in a transverse direction perpendicular to the axial dimension of the airflow (substantially horizontal), that is greater than the transverse dimension of the fourth housing. In this way, by installing the third alternator 138 larger than the fourth alternator 140, it is possible to take advantage of the aerodynamic profile of the shaft 121, which is wider upstream than downstream in the axial direction of the airflow in a cross section taken tangentially relative to the longitudinal axis 105.

[0170] Where appropriate, the third housing is in contact with the wall 152 of the arm 121, in particular approximately tangentially with respect to the longitudinal axis 105, or even flush with the wall 152 of the arm 121, in order to improve the cooling of the third alternator 138 by the secondary flow circulating in the secondary flow path 106. The third housing is in contact with the wall 152, for example via a layer of thermally conductive material suitable for preventing wear due to friction between the wall 152 and the third housing and / or for damping vibrations, such as a silicone elastomer.

[0171] The third and fourth drive shafts 137 and 139 are located radially outside the longitudinal axis 105 , while the first and second drive shafts 131 and 133 are located radially inside. This also makes it possible to limit the dimensions of the first and second intermediate shafts 127 and 128 along the intermediate axis 130 .

[0172] Alternatively (not shown), first drive axis 135 and second drive axis 136 are oriented generally radially relative to longitudinal axis 105 .

[0173] For example, first ends 137a, 139a of third and fourth drive shafts 137, 139 are located radially inward relative to longitudinal axis 105, while second ends 137b, 139b of third and fourth drive shafts 137, 139 are located radially outward. This makes it possible to limit the dimensions of first and second intermediate shafts 127, 128 along intermediate axis 130.

[0174] The third drive shaft 137 and the fourth drive shaft 139 are located downstream, while the first drive shaft 131 and the second drive shaft 133 are located upstream. This also makes it possible to limit the size of the first intermediate shaft 127 and the second intermediate shaft 128 along the intermediate axis 130.

[0175] Alternatively (not shown), the third and fourth drive axes 135 and 136 are inclined in both the axial and radial directions. This enables a compromise to be achieved between the increase in height of the secondary flow path 106 and the axial extension of the arm 121 accommodating the generator assembly 129 at the bifurcation region.

[0176] Thus, according to this second embodiment, the first drive shaft 131 and the second drive shaft 133 form a first pair of drive shafts, while the third drive shaft 137 and the fourth drive shaft 139 form a second pair of drive shafts. Of course, one or more additional pairs of drive shafts may be provided, such as a third pair of drive shafts (not shown) that derives mechanical power from the second pair of drive shafts 137, 139 in the same manner as the second pair of drive shafts 137, 139 derives mechanical power from the first pair of drive shafts 131, 133, or even a fourth pair of drive shafts (not shown) that derives mechanical power from the third pair of drive shafts in the same manner as the third pair of drive shafts derives mechanical power from the second pair of drive shafts 137, 139, etc. Therefore, the above description applies to these additional pairs of drive shafts.

[0177] according to Figure 3 In the third embodiment shown, a generator assembly 129 of a turbine engine 100C includes an inner drive shaft 143 designed to rotate relative to the casings 117, 118, 121 about a drive axis 144, an outer drive shaft 145 designed to rotate in an opposite direction of rotation relative to the casings 117, 118, 121 about the inner drive shaft 143, and one or more alternators 146. The inner drive shaft 143 and the outer drive shaft 145 are concentric and rotate in opposite directions.

[0178] The inner drive shaft 143 is also designed to receive mechanical power from the first intermediate shaft 127 or from the second intermediate shaft 128, while the outer drive shaft 145 is designed to receive mechanical power from the second intermediate shaft 128 or from the first intermediate shaft 127. Figure 3 In the example shown, the inner drive shaft 143 receives mechanical power from the first intermediate shaft 127 , while the outer drive shaft 145 receives mechanical power from the second intermediate shaft 128 .

[0179] Each of the alternators 146 includes an inductor-type or inductive inner body 146a, which is mounted and fixed for rotation about the drive axis together with the inner drive shaft 143, and an inductive or inductive outer body 146b, which is mounted and fixed for rotation about the drive axis together with the outer drive shaft 145, and is positioned facing the inner body 146a. The alternators 146 are, for example, evenly distributed along the inner drive shaft 143 and the outer drive shaft 145.

[0180] In this manner, relative rotation of the inner body 146a of each alternator 146 with respect to the outer body 146b of said alternator 146 generates a change in electromagnetic flux that induces an alternating current in the inner body 146a or the outer body 146b.

[0181] Furthermore, the inner body 146a and the outer body 146b of each alternator 146 are capable of rotating in opposite rotational directions relative to each other, and the generator assembly 129 enables more electricity to be generated.

[0182] The inner body 146a of the alternator 146 comprises at least one permanent magnet or at least one electromagnet, for example formed by a winding powered by direct current, whereas the outer body 146b of the alternator 146 comprises at least one winding.

[0183] Alternatively (not shown), the outer body 146b of the alternator 146 includes, for example, at least one winding, and the outer body 146b of the alternator 146 includes at least one permanent magnet or at least one electromagnet formed by the winding powered by direct current. The inner drive shaft 143 and the outer drive shaft 145 each extend along the drive axis 144 between a first end 143a, 145a and an opposite second end 143b, 145b.

[0184] The first end 143 a , 145 a of each of the inner drive shaft 143 and the outer drive shaft 145 is designed to receive mechanical power from the first intermediate shaft 127 or the second intermediate shaft 128 .

[0185] To this end, the first end 143a, 145a of each of the inner drive shaft 143 and the outer drive shaft 145 carries, for example, a gear 143c, 145c, which is fixed so as to rotate together with the inner drive shaft 143 or the outer drive shaft 145 about the drive axis 144. The gears 143c, 145c of the inner drive shaft 143 and the outer drive shaft 145 also mesh with the second gears 127d, 128d of the first intermediate shaft 127 or the second intermediate shaft 128.

[0186] The gears 143 c and 145 c of the inner drive shaft 143 and the outer drive shaft 145 and the second gears 127 d and 128 d of the first intermediate shaft 127 and the second intermediate shaft 128 are, for example, gears with bevel teeth.

[0187] When the first intermediate shaft 127 and the second intermediate shaft 128 are designed to rotate in the same rotation direction, for example, an additional pinion is provided to transmit mechanical power between the gear 127d of the first intermediate shaft 127 and the gear 143c of the drive shaft driven by the first intermediate shaft among the inner drive shaft 143 and the outer drive shaft 145, or to transmit mechanical power between the gear 128d of the second intermediate shaft 128 and the gear 145c of the drive shaft driven by the second intermediate shaft among the inner drive shaft 143 and the outer drive shaft 145, so as to reverse the rotation direction of the inner drive shaft 143 and the outer drive shaft 145.

[0188] The drive axis 144 is, for example, coplanar with the longitudinal axis 105 and / or the center axis 130 of the first intermediate shaft 127 and the second intermediate shaft 128 .

[0189] The drive axis 144 is oriented, for example, generally radially relative to the longitudinal axis 105. The radial orientation of the drive axis 144 is intended to facilitate an increase in the height of the secondary flow path 106, rather than an axial extension of the arm 121 at the bifurcation region to accommodate the generator assembly 129. This further enables the main cross-section of the arm 121 to be limited.

[0190] The first ends 143a, 145a of the inner drive shaft 143 and the outer drive shaft 145 are located radially inwardly, for example, relative to the longitudinal axis 105, while the second ends 143b, 145b of the inner drive shaft 143 and the outer drive shaft 145 are located radially outwardly. This makes it possible to limit the dimensions of the first intermediate shaft 127 and the second intermediate shaft 128 along the intermediate axis 130.

[0191] Alternatively (not shown), the drive axis 144 is oriented generally axially. The drive axis is substantially parallel to the longitudinal axis 105. The axial orientation of the drive axis 144 is intended to facilitate axial extension of the arm 121 to accommodate the generator assembly 129 at the bifurcation region, rather than increasing the height of the secondary flow path 106.

[0192] The first ends 143a, 145a of the inner and outer drive shafts 143, 145 are located upstream, while the second ends 143b, 145b of the inner and outer drive shafts 143, 145 are located downstream. This makes it possible to limit the dimensions of the first and second intermediate shafts 127, 128 along the intermediate axis 130.

[0193] Alternatively (not shown), the drive axis 144 is inclined in both the axial and radial directions. This enables a compromise to be achieved between the increase in height of the secondary flow path 106 and the axial extension of the arm 121 accommodating the generator assembly 129 at the bifurcation region.

[0194] Thus, according to this third embodiment, the inner drive shaft 143 and the outer drive shaft 145 form a pair of drive shafts. Of course, one or more additional pairs of drive shafts may be provided, such as a second pair of drive shafts (not shown) that derives mechanical power from the first pair of drive shafts formed by the inner drive shaft 143 and the outer drive shaft 145, the second pair of drive shafts deriving mechanical power in the same manner as the first pair of drive shafts 143, 145 derives mechanical power from the first intermediate shaft 127, 128, or even a third pair of drive shafts (not shown) that derives mechanical power from the second pair of drive shafts in the same manner as the second pair of drive shafts derives mechanical power from the first pair of drive shafts 143, 145, and so on. Therefore, the above description applies to these additional pairs of drive shafts. The longitudinal axis 105 and the drive axes 144 of these pairs of drive shafts 143, 145 are, for example, comprised in the same plane.

[0195] Intermediate pinions 147 and 148 may also be provided to obtain mechanical power from the first intermediate shaft 127 and the second intermediate shaft 128 and transmit the mechanical power to the first gears 131c and 133c of the first drive shaft 131 and the second drive shaft 133 or to the gears 143c and 145c of the inner drive shaft 143 and the outer drive shaft 145. The intermediate pinions 147 and 148 may be provided, for example, at Figure 3 Shown in.

[0196] In the case where the additional pinion reverses the rotation direction of the inner drive shaft 143 and the outer drive shaft 145, the additional pinion is added to the intermediate pinions 147, 148 to transmit mechanical power from one of the first intermediate shaft 127 and the second intermediate shaft 128 to one of the intermediate pinions 147, 148, or from one of the intermediate pinions 147, 148 to one of the inner drive shaft 143 and the outer drive shaft 145.

[0197] The turbine engine 100A, 100B, 100C may also include a regulation system 149 through which the generator assembly 129 delivers electrical energy to one or more accessories 125 , 126 .

[0198] The regulation system 149 is particularly designed to receive the alternating currents generated by the first and second alternators 132 , 134 and / or by the third and fourth alternators 138 , 140 or by the alternator 146 and to deliver from these alternating currents a current capable of operating one or more accessories 125 , 126 .

[0199] The regulation system 149 is, for example, provided with an electrical energy storage device (not shown), which is designed to store excess electrical energy generated by the generator assembly 129 and to deliver the stored electrical energy to one or more accessories 125, 126 when the electrical energy generated by the generator assembly 129 is insufficient to power one or more accessories 125, 126.

Claims

1. A double-ducted turbine engine (100A, 100B, 100C), comprising a fan (102) and a splitter nose (103) from upstream to downstream in the axial direction of airflow, wherein a primary airflow flow passage (104) called a primary flow path and a secondary airflow flow passage (106) called a secondary flow path surrounding the primary flow path (104) are formed from the splitter nose, and the turbine engine (100A, 100B, 100C) further comprises: a stationary housing (117, 118, 121) comprising an arm (121) extending radially relative to the longitudinal axis (105) in the secondary flow path (106), a first shaft (122), called the low-pressure shaft, designed to rotate relative to the housing (117, 118, 121) about a longitudinal axis (105) oriented in the axial direction of the air flow, a second shaft (123), called the high-pressure shaft, designed to rotate about the low-pressure shaft (122) relative to the housing (117, 118, 121), the high-pressure shaft (123) being concentric with the low-pressure shaft (122), - at least one accessory (125, 126) designed to be driven by an electric motor powered by electrical energy; - an upper part, by means of which the turbine engine (100A, 100B, 100C) is intended to be attached to an aircraft, - an opposite lower portion in a vertical direction orthogonal to the longitudinal axis (105), in which the arm (121) extends substantially vertically in the secondary flow path (106), The turbine engine (100A, 100B, 100C) is characterized in that the turbine engine further comprises: a first intermediate shaft (127) designed to receive mechanical power from the low-pressure shaft (122), - a second intermediate shaft (128) designed to receive mechanical power from the high-pressure shaft (123), an electric generator assembly (129) housed in the arm (121), the electric generator assembly being coupled on the one hand to the first intermediate shaft (127) and on the other hand to the second intermediate shaft (128) so as to receive mechanical power from the first intermediate shaft (127) on the one hand and from the second intermediate shaft (128) on the other hand, the generator assembly (129) being further designed to convert the mechanical power received from the first and second intermediate shafts (127, 128) into electrical energy in order to power the electric motor driving one or more accessories (125, 126), the electrical energy for powering the electric motor driving the one or more accessories (125, 126) thus coming simultaneously from the mechanical power derived from the low-voltage shaft (122) and from the mechanical power derived from the high-voltage shaft (123), Wherein, the generator assembly (129) comprises: a first drive shaft (131) designed to receive mechanical power from the first intermediate shaft (127) and to rotate relative to the housing (117, 118, 121) about a first drive axis (135), a second drive shaft (133) designed to receive mechanical power from the second intermediate shaft (128) and to rotate relative to the housing (117, 118, 121) about a second drive axis (136), the first drive shaft and the second drive shaft (131, 133) being coaxial, and each of the first drive shaft and the second drive shaft being designed to rotate about the first drive axis and the second drive axis (135, 136) in opposite directions of rotation, the first drive axis and the second drive axis coinciding, - one or more first alternators (132), each of the one or more first alternators comprising an inductor-type rotor and an induction rotor, the inductor-type rotor being mounted and fixed for rotation together with one of the first and second drive shafts (131, 133) about the first and second drive axes (135, 136), the induction rotor being mounted and fixed for rotation together with the other of the first and second drive shafts (131, 133) about the first and second drive axes (135, 136), - one or more second AC generators (134), each of the one or more second AC generators comprising an inductor-type rotor and an inductor stator, the inductor-type rotor being mounted and fixed to rotate about the first drive axis and the second drive axis (135, 136) together with a drive shaft of the first drive shaft and the second drive shaft (131, 133) which is surrounded by the other of the first drive shaft and the second drive shaft (131, 133), the inductor stator being fixed relative to the inductor-type rotor of the second AC generator (134).

2. The turbine engine (100A, 100B, 100C) according to claim 1, wherein: The first and second intermediate shafts (127, 128) are coaxial, each of the first and second intermediate shafts being designed to rotate independently of each other about a common intermediate axis (130) relative to the housing (117, 118, 121).

3. The turbine engine (100A, 100B, 100C) according to claim 1, wherein: The secondary flow path (106) is defined radially relative to the longitudinal axis (105) by an outer shroud (117) and an inner hub (118) of the housing (117, 118, 121), the outer shroud (117) and the hub (118) being concentric and centered about the longitudinal axis (105), wherein the arm (121) housing the generator assembly (129) extends radially between the outer shroud (117) and the hub (118) relative to the longitudinal axis (105).

4. The turbine engine (100A, 100B, 100C) according to claim 1, wherein: The arm (121) accommodates the auxiliary component upstream in the axial direction of the airflow and accommodates the generator assembly (129) downstream in the axial direction of the airflow.

5. The turbine engine (100A, 100B) according to claim 1, wherein: The first and second drive axes (135, 136) are oriented generally in an axial direction of the air flow.

6. The turbine engine (100B) according to claim 1, wherein: The generator assembly (129) comprises: a third drive shaft (137) designed to receive mechanical power from the first drive shaft (131) and to rotate relative to the housing (117, 118, 121) about a third drive axis (141), - a fourth drive shaft (139), the fourth drive shaft being designed to receive mechanical power from the second drive shaft (133) and to rotate relative to the housing (117, 118, 121) about a fourth drive axis (142), the third drive shaft and the fourth drive shaft (137, 139) being coaxial, each of the third drive shaft and the fourth drive shaft being designed to rotate about the third drive axis and the fourth drive axis (141, 142) in opposite rotational directions, the third drive axis and the fourth drive axis being coincident, - one or more third AC generators (138), each of the one or more third AC generators comprising an inductor-type rotor and an induction rotor, the inductor-type rotor being mounted and fixed for rotation together with one of the third and fourth drive shafts (137, 139) about the third and fourth drive axes (141, 142), the induction rotor being mounted and fixed for rotation together with the other of the third and fourth drive shafts (137, 139) about the third and fourth drive axes (141, 142), - one or more fourth AC generators (140), each of the one or more fourth AC generators comprising an inductor-type rotor and an inductor stator, the inductor-type rotor being mounted and fixed to rotate about the third and fourth drive axes (141, 142) together with the drive shaft of the third and fourth drive shafts (137, 139) surrounded by the other of the third and fourth drive shafts (137, 139), the inductor stator being fixed relative to the inductor-type rotor of the fourth AC generator (140).

7. The turbine engine (100B) according to claim 6, wherein: The longitudinal axis (105) and the first, second, third and fourth drive axes (135, 136, 141, 142) are included in the same plane.

8. The turbine engine (100B) according to claim 7, wherein: The third drive axis and the fourth drive axis (141, 142) are parallel to the first drive axis and the second drive axis (135, 136), respectively.

9. The turbine engine (100B) according to claim 8, wherein: The first and second drive axes (135, 136) are oriented substantially in the axial direction of the airflow, the third and fourth drive axes (137, 139) are located radially outward relative to the longitudinal axis (105), and the first and second drive axes (131, 133) are located radially inward.

10. The turbine engine (100A, 100B) according to claim 6, wherein: - the first AC generator (132) is located upstream along the axial direction of the airflow, and the second AC generator (134) is located downstream along the axial direction of the airflow; or The first and third alternators (132, 138) are located upstream in the axial direction of the airflow, and the second and fourth alternators (134, 140) are located downstream in the axial direction of the airflow.

11. The turbine engine (100A, 100B) according to claim 10, wherein: - the first alternator (132) and the second alternator (134) are housed in a first housing (150) and a second housing (151), respectively, the first housing and the second housing being housed in the arm (121), the first housing (150) having a transverse dimension taken in a transverse direction perpendicular to the axial dimension of the air flow, the transverse direction being substantially horizontal, the transverse dimension of the first housing being greater than the transverse dimension of the second housing (151); and / or - the third alternator (138) and the fourth alternator (140) are respectively housed in a first housing (150) or a third housing, which is itself housed in the arm (121), and a second housing (151) or a fourth housing, which is itself housed in the arm (121), the third housing having a transverse dimension taken along a transverse direction perpendicular to the axial dimension of the airflow, the transverse direction being substantially horizontal, the transverse dimension of the third housing being greater than the transverse dimension of the fourth housing.

12. The turbine engine (100A, 100B) according to claim 11, wherein: The first housing (150) and / or the third housing are arranged to be in contact with the wall (152) of the arm (121).

13. The turbine engine (100C) according to claim 1, wherein: The generator assembly (129) comprises: an inner drive shaft (143) designed to rotate relative to the housing (117, 118, 121) about a drive axis (144) and to receive mechanical power from the first intermediate shaft (127) or the second intermediate shaft (128), - an outer drive shaft (145) designed to rotate in an opposite direction of rotation relative to the housing (117, 118, 121) about the inner drive shaft (143) and to receive mechanical power from the second intermediate shaft (128) or the first intermediate shaft (127), the inner drive shaft and the outer drive shaft (143, 145) being concentric, - one or more alternators (146), each of the one or more alternators comprising an inductor-type or inductive inner body (146a) and an inductive or inductive outer body (146b), the inner body being mounted and fixed to rotate together with the inner drive shaft (143) around the drive axis (144), the outer body being mounted and fixed to rotate together with the outer drive shaft (145) around the drive axis (144), the outer body being positioned facing the inner body (146a).

14. The turbine engine (100C) according to claim 13, wherein: - the drive axis (144) is oriented substantially radially relative to the longitudinal axis (105); or The drive axis (144) is oriented substantially in the axial direction of the air flow.

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