Abstract: The invention relates to a twin-spool gas turbine engine comprising a high-pressure rotor (and a low-pressure rotor, which rotors are mounted in bearings supported by an intermediate casing, at least one accessory gear box, a drive means, driving radial and coaxial shafts for transmitting movement to the accessory gear box, the drive means comprising a high-pressure drive gear driving one of said radial shafts and connected to the high-pressure rotor, a low-pressure drive gear connected to the low-pressure rotor upstream of the high-pressure rotor and driving the other of said radial shafts, the low-pressure drive gear being supported in the intermediate casing by an axial-positioning bearing.

Abstract: A turbomachine having a longitudinal axis, the turbomachine comprising an annular rotor centered on the longitudinal axis of the turbomachine, an annular stator disposed coaxially around the rotor, at least one ball bearing disposed on the rotor and rotatably supporting said stator, the inside of the rotor defining part of an oil enclosure for cooling and lubricating the balls of the bearing, an electricity generator having a secondary magnetic circuit secured to the stator and a primary magnetic circuit constrained to rotate with the rotor, and a detector device for automatically detecting ferromagnetic particles in the oil enclosure, said detector device being powered electrically by electromagnetic induction.

Abstract: The present invention relates to a device for, in a gas turbine engine, braking a turbine comprising a rotor, having at least one disk (63?) with a rim (63?B), driving a shaft and capable of rotating with respect to a stator, this device being for the event of said shaft breaking and comprising a first braking member (110), secured to said rim and provided with at least one cutting element (110A), and a second braking member (120) secured to the stator downstream of the rim (63?B), comprising a ring-shaped element (120A) made of a material that can be cut by the cutting element (110A), the two braking members coming into contact with one another through axial displacement of the rotor once the shaft has broken, the cutting element (110A) of the first braking member (110) cutting the ring-shaped element (120A) of the second braking member (120).

Abstract: The present invention relates to a turbomachine front portion (1) comprising an internal support shroud (10) for the fan outlet guide vanes (12), and a flow splitter fairing (14) from which a primary duct (16) and a secondary duct (18) originate. According to the invention, said front portion comprises at least one deflector system (30) intended to prevent/limit the ingress of hailstones inside said primary duct, the system (30) comprising at least one deflecting surface (32) together with an actuator (34) for moving the surface (32) from a retracted position to a deployed position for deflecting the hailstones, the system (30) being mounted on the shroud (10) such that, in the deployed position, a downstream end (62) of the surface (32) is situated upstream of the splitter fairing (14).

Abstract: A rotary assembly for a turbomachine fan comprises: a disk rotatable about an axis; a plurality of blades fastened by their roots to said disk and extending radially outwards from said disk; and a plurality of inter-blade platforms, each extending between two adjacent blades and defining the inner profile for the flow section of the fluid passing through the fan. On their facing side faces, these adjacent blades present slides between which said platform can slide, these slides limiting outward radial movement of said platform.

Abstract: A turbomachine fan (10) comprising blades (16) mounted in slots (23) at the periphery of a rotor disk (12), and inter-blade platforms (20) having radial lugs for fastening to corresponding lugs of the disk (12), wherein each platform (20) is fastened to the disk (12) by means of a pin (64) inserted into orifices in the lugs of the platform (20) and into corresponding orifices in the lugs of the disk (12).

Abstract: The invention relates to an aeroengine comprising: a primary air circuit; a high-pressure compressor fed by said primary air; and a secondary air circuit. The engine further comprising at least one heat exchanger mounted in the primary air circuit upstream from said high-pressure compressor, said heat exchanger comprising a cold secondary circuit and a hot primary circuit, said hot primary circuit being fed with air from said primary air circuit and said cold secondary circuit being fed with air from the secondary air circuit. The cold circuit of the heat exchanger is fed by pipes that open out into the secondary air circuit.

Abstract: In a compressor stage (7) comprising a movable bladed wheel (10) having movable blades (8) and a fixed bladed wheel (12) having fixed blades (9), the air tapping circuit arrangement comprises a movable wheel manifold (24) designed to collect an air flow aspirated from the movable blades (8) and a fixed wheel manifold (28) designed to collect an air flow aspirated from the fixed blades (9), and said movable wheel manifold (24) is placed on the periphery of said compressor stage (7) facing said movable wheel (10) and said fixed wheel manifold (28) is superposed on said movable wheel manifold (24). Application to a compressor stage (7) of a turbojet (1).

Abstract: A compressor with a centripetal air takeoff system that includes pipes installed between an outer collar and an inner collar. Each pipe is fitted in a hole in the outer collar and in a hole in the inner collar. The system further includes a locking mechanism between the pipe and the inner collar.

Abstract: A compressor with a centripetal air takeoff system that includes pipes installed between an outer collar and an inner collar. Each pipe is fitted in a hole in the outer collar and in a hole in the inner collar. The system further includes a locking mechanism between the pipe and the inner collar.

Abstract: A two-spool bypass turbojet includes a low-pressure spool having a rear portion carrying a low-pressure turbine provided with a low-pressure rotor. The turbojet includes a support structure connected to a casing and to a rear bearing in which the rotor is mounted. The bearing can be situated in an enclosure including a liquid lubricant feed. The enclosure can be put to atmospheric pressure via an air feed pipe connected to the enclosure via a link. The turbojet further includes an electricity generator connected to the rear end of the low-pressure rotor that extends downstream from the link, which link is secured to the rotor and includes a device for guiding the liquid lubricant from the feed to the bearing.

Abstract: The coupling device (20) is intended for coupling a turbine upstream guide vane (8), said upstream guide vane (8) being coupled to a supporting part (22) itself attached to a stabilizing part (24). The coupling device (20) comprises: interlocking means for interlocking a supporting end (26) of the supporting part (22) with a stabilizing end (30) of the stabilizing part (24), and a retaining part (60) to keep said supporting end (26) and said stabilizing end (30) interlocked. Application to the coupling of an upstream guide vane (8) of a turbojet turbine.

Abstract: A device (40) for limiting overspeed in a turbomachine in the event of breakage of the turbine shaft (24), comprising means (38, 44) of propelling a pin (42) into the path of the blades (22), these propelling means being controlled by means (36) that detect overspeed or that the turbine shaft has broken.

Abstract: A turbomachine rotor including at least one disk having a ring constituted, for example, by a winding of metal-coated silicon carbide or alumina yarn. According to the invention, the composite ring is received in a closed annular cavity, e.g. defining by machining a groove in an enlarged portion of the disk and closing the groove by means of an annular plate after the ring has been put into place.

Abstract: The present invention relates to the manufacture of an integrally bladed disk, especially for a turbomachine rotor. It relates more particularly to a process for manufacturing such a disk by friction welding. The manufacturing process comprises the following successive steps: arrangement of a plurality of blades (1) in the form of a ring in a mold (2) having symmetry of revolution; casting of a degradable material (3), preheated to a temperature above its melting point, onto the ring of blades (1) in the mold (2); extraction of the molded ring (10) obtained after the degradable material (3) has solidified; welding of the molded ring (10) onto a disk (4); and elimination of the degradable material (3). According to the invention, the welding is carried out by friction welding.

Abstract: Turbomachine such as an aircraft turbojet comprising an electrical generator/starter (26) that can be mounted and dismounted by axial translation in an upstream enclosure (18) of the turbomachine between the low-pressure compressor and the high-pressure compressor, and couple to electrical cables (34) which extend inside the structural arms (12) of the intermediate casing (10) of the turbomachine.

Abstract: The present invention relates to a device for ventilating turbine components in a gas turbine engine comprising two turbine rotors mechanically independent of each other, each with at least one turbine disk, an HP turbine disk and an LP turbine disk respectively, and with a first circuit for ventilating the LP turbine. The device comprises an air compression wheel arranged downstream of the HP turbine disk especially between said two turbine disks, HP and LP in order to assist the circulation of the air in said first circuit. The invention also relates to the wheel.

Abstract: A turbomachine includes a high-pressure spool, an axial compressor of axis X mounted on a rotor and including a casing and at least one rear bearing disposed between the casing and the rotor of the compressor. The turbomachine further includes an electricity generator coaxial with the spool and including a primary magnetic circuit that is constrained to rotate with the rotor of the compressor and a secondary magnetic circuit that is secured to the casing. The electricity generator is disposed upstream from the rear bearing and includes at least a first cooling circuit surrounding the secondary magnetic circuit and extended by a nozzle for lubricating the rear bearing.

Abstract: A turbomachine rotor including at least one disk having a ring constituted, for example, by a winding of metal-coated silicon carbide or alumina yarn. According to the invention, the composite ring is received in a closed annular cavity, e.g. defining by machining a groove in an enlarged portion of the disk and closing the groove by means of an annular plate after the ring has been put into place.

Abstract: Recovery of oil around the lubricating chamber of the rear rolling bearing of the shaft of a jet engine. According to the invention the shaft (14) is supported by a rolling bearing (20) situated in a lubricating chamber (24) surrounded by a single recovery chamber (26) having a seal (48) situated downstream from the rotor of the turbine (12) driving the shaft.