Abstract: A head loss element is interposed between the outlet from the pump delivering high pressure fuel and the pipe feeding combustion chamber injectors. A servo-valve for feeding a hydraulic actuator of a variable-geometry component of the engine has an HP admission inlet connected to the outlet from the pump upstream from the head loss element and an LP outlet connected to the feed pipe downstream from the head loss element. Thus, the flow rate taken upstream from the head loss element for driving the actuator is compensated by the flow rate reinjected downstream from the head loss element, thereby avoiding any movement of the variable-geometry component giving rise to a disturbance in the flow rate delivered to the injectors.

Abstract: A system for gearing, the system comprising a toothed wheel mounted on a shaft, the wheel being pierced by channels fed with lubricant, each channel opening out to the toothed periphery of the wheel. Said wheel is mounted on an end portion of the shaft, so as to be capable of being rotated by said shaft, said end portion being hollow so as to present an inside chamber, said chamber opening out to the end of the shaft via an orifice. Said channels communicate with said chamber. The system includes an injector for injecting lubricant into the chamber, the injector being situated outside the chamber and facing said orifice in such a manner as to inject the lubricant through said orifice, the lubricant penetrating into and flowing along the channels to the toothed periphery of the wheel under the effect of centrifugal force associated with rotation of the shaft.

Abstract: A system for powering and controlling electrical equipment of an aircraft engine or of its environment, includes at least one DC voltage power supply bus, a set of power supply modules associated with an electrical equipment group, each module including a voltage converter and a selector circuit inserted between the outputs from the modules of the set of modules and the pieces of equipment of the equipment group. The modules and the selector circuit are controlled to activate each piece of equipment of the equipment group by connecting it to at least one of the modules, with an emergency module being put into operation in the event of one of the other modules failing.

Abstract: This invention relates to an elbow connection (10) for an electric cable (6) with several wires (5). According to the invention, the connection (10) comprises a fluted central carrier (1) running longitudinally (L), made up of a flexible stem (2), comprising several substantially parallel recesses (4), and a strengthening rod (3), arranged at the core of the stem (2) and suitable for being bent.

Abstract: Supporting collar (10) for an element (8) such as a cable or a pipe, comprising a strap (18) capable of being fixed to a support (12), an outer sleeve (16) encircled by this strap (18), an inner sleeve (14) through which said element (8) can pass, and a deformable web (15) connecting said sleeves (14, 16) and allowing the inner sleeve (14) to move relative to the outer sleeve (16). The outer sleeve (16), the web (15) and the inner sleeve (14) are formed as a single central part made of an elastomeric material, e.g. fluorosilicone. The element (8) is secured to the inner sleeve (14) with the aid of a fastening collar (20) that is fastened around the inner sleeve (14).

Abstract: A method for monitoring plane engines The present invention relates to a method for monitoring engines of a plane comprising at least two engines (m1, m2, m3, m4), each engine (m1, m2, m3, m4) being controlled and monitored by an engine monitoring calculator (1, 2, 3, 4), said calculators (1, 2, 3, 4) being connected between them by a communication network (5) and each calculator (1, 2, 3, 4) monitoring the operating parameters (p, V) of the engine (m1, m2, m3, m4) it monitors. The method is characterized in that both calculators (1, 2, 3, 4) emit (60; 100) on the network (5) the value (V(k)) of at least one of said parameters (p(k)) for being compared (62; 102, 103, 104) with those (V(k?)) of the same parameter (p(k) p(k?)) emitted by the other calculator (1, 2, 3, 4), and in that, if a value (k)) deviates from the other (V(k?)) by a difference (d1(k), d2(k), d3(k)) higher than a predetermined threshold (S), one of the engines (m(k)) is diagnosed as being in an abnormal operation.

Abstract: A device supplying electricity power to and actuating equipments of a gas turbine airplane engine, including an electricity power supply circuit dedicated to the engine and distinct from an electricity network on board the plane and excitation, control or servo circuits for pieces of electrical equipment of the engine. The engine electrical power supply circuit includes a first bus distributing DC or AC voltage to excitation, control or servo circuits for first pieces of electrical equipment of the engine, a second bus distributing DC or AC voltage to excitation, control or servo circuits for other pieces of electrical equipment of the engine requiring higher electrical power compared with the first pieces of equipment, and a third bus connected to receive power from an electricity source such as an airplane on-board electricity distribution network or an electricity generator dedicated to the engine and driven thereby. The third bus supplies the first and second bus with electricity power.

Abstract: A gas-turbine starter/generator comprises: a generator module comprising a first casing, a generator housed in the first casing, and a first shaft constrained to rotate with the rotor of the generator, projecting from the first casing, and carrying a first mechanical coupling member; an exciter module, comprising a second casing, an exciter housed in the second casing, and a second shaft distinct from the first shaft, constrained to rotate with the rotor of the exciter, projecting from the second casing, and carrying a second mechanical coupling member; and an electrical connection comprising a rectifier and at least one connector for connecting the secondary circuit of the exciter to the primary circuit of the generator. The mechanical coupling members are coupled to a common gearwheel or to respective different gearwheels of a gearbox of the gas turbine.

Abstract: A process for soldering an electronic component onto a support which includes at least one heat drain for the component. The method uses a solder paste which incorporates a stripping flux activated at a first temperature, and a solder alloy melted at a second temperature. The process includes preheating the support on the face opposite the component through the heat drain up to the first temperature, placing the component on the support with the solder paste, heating the component by applying a hot gas at a sufficiently high temperature to bring the solder alloy to the melting temperature.

Abstract: The actuator (50) comprises a slide (52) carrying at least two stages (54, 56) and being capable of sliding in a cylinder and two control chambers (62, 64) connected to respective use holes (U1, U2) of an electrically controlled servo-valve hydraulic distributor (20). The control chambers (62, 64) are each situated on one side of a respective stage and an intermediate chamber connected to high or low pressure is situated between the other sides of the stages. In the event of electrical control failure, the distributor (20) slide is taken to a safety position in which the control chambers (62, 64) of the actuator (50) are at the same low or high pressure opposed to that applying in the intermediate chamber (66) so that each stage of the actuator slide is then subjected to high pressure on one side and to low pressure on the other side.

Abstract: A device for cooling electrical or electronic equipment in a turbomachine, such as a unit for controlling actuators for variable-geometry elements, the device comprising at least one vortex tube having an inlet connected to means for feeding pressurized air taken from an element of the turbomachine, and a cold air outlet connected to means for cooling the electrical equipment.

Abstract: In order to reduce the cost of a chopping converter supplying a continuous voltage at the terminals of a load (Z), a circuit with three windings (Lp, Ls1, Ls2) and a single magnetic core is proposed, according to the present invention, which enables the cost and the size of the circuit to be reduced. It is then necessary to add two diodes (D3, D4) to the circuit, but these elements are of low cost and of low size.

Abstract: In order to reduce the cost of a chopping converter supplying a continuous voltage at the terminals of a load (Z), a circuit with two windings (Lp, Ls) and a single magnetic core is proposed, according to the present invention, which enables the cost and the size of the circuit to be reduced. It is then necessary to add two diodes (D3, D4) to the circuit, but these elements are inexpensive and of small size.

Abstract: This invention is related to an electronic board comprising an area forming a BGA type electronic component backing, an electric heating resistor at right angle to said area, said resistor being able to supply an amount of heat for soldering the component onto the plate, characterized in that the board comprises a plurality of conductive layers alternating with electrically insulating layers, said resistor forming one of the conductive layers immediately underlying the surface layer. The board comprises, if need be, a thermal drain. This invention is also related to a facility for implementing the method. It also allows for an electronic board to be repaired through replacing defective members without risking to unsolder or to damage adjacent members.

Abstract: This invention relates to a device for measuring the position of a piston (2) in a cylinder (1), extending according to an axis, the device comprising at least two position sensors (3, 4) respectively comprising: a first sensor member (20, 40) integral with a supporting pallet (31) linked to the piston (2), a second sensor member (10, 30) integral with the cylinder (1), the first and second members of each sensor being arranged for being mobile in translation one relative to the other, along an axis parallel to the axis of the cylinder (1), the device being characterized in that the first sensor members (20, 40) are integral with the same supporting pallet (31) being linked to the piston (2) by a ball joint link (50). Using the device of this invention, a position sensor can be arranged in the cylinder, without having the transversal strains on the piston being transmitted to it, while the piston remains free in rotation about the axis of the cylindrical barrel.

Abstract: A communications gateway comprising: a first entity including at least one packet-switching interconnection element communicating by data packets; a second entity including a set of ports communicating by means of an elementary data set; and conversion means connecting said first entity with said second entity to convert between said data packets and said elementary data sets in order to enable communication between said first and second entities.

Abstract: A fuel-injection device in a turbomachine, comprising a high-pressure pump (10) supplying a flow control valve (16), whose outlet is connected via a pressurization and cut-off valve (20) to a fuel-injector (18) feed pipe (22), the valve (20) being connected to the inlet and to the outlet of the pump (10) in order to define two fuel pressurization thresholds, one being used to start-up and restart the turbomachine, and the other being used for operating the turbomachine as from an idle speed and for commanding an equipment with variable geometry (24).

Abstract: A fuel supply device includes a fuel supply pipe receiving fuel at a non-regulated pressure delivered by a pump, a device for measuring the flow rate of fuel in the pipe, a first controlled variable-restriction valve mounted in the supply pipe, a control system connected to the flow rate measurement device and to the first valve to control the valve to deliver fuel to the engine at a desired flow rate under normal operating conditions of the engine, a second controlled variable-restriction valve mounted in the supply pipe in series with the first valve, and a control for controlling the second valve to enable the engine to be supplied with fuel at an adjustable, reduced flow rate in response to detecting over-speed or over-thrust of the engine.

Abstract: Hydromechanical regulator for controlling the flow of fuel injected into a turbomachine by means of a fuel feed unit (10), comprising a tachometric balance (20) having a beam consisting of two arms (24, 26), which beam can move about a pivot pin (22) under the action of at least a first force F1 applied by a drive rod (18) of the fuel feed unit via a first elastic member (28), and a rod (36) associated with a drive piston (38) for applying, via a second elastic member (40), a force F4 opposing the first force F1 to the beam of the balance so as to cause the fuel feed unit to open further during the transition from a first engine acceleration law to a second engine acceleration law.

Abstract: The present invention relates to a pinion being integral with a rotatably mounted shaft in a support by means of a cleavable element arranged to disengage the pinion from the shaft in case of an overcouple between the pinion and the shaft. A guiding bearing, pending between the pinion and the shaft, is arranged to rotatably guide the pinion around the shaft, in case of a disengagement of the pinion from the shaft. In a turbomachine, a gear box comprising such a gear allows the driving of auxiliary machines in case of a breakdown of a shaft in the gear box.