Airbus Helicopters

Eurocopter

Michel Vialle

Alban Corpron

Frederic Dyrla

Sylvain Berthalon

Frédéric Dyrla

The present invention relates to a method of increasing the safety of a power plant provided with at least one heat engine and a gearbox (BTP), the engine driving the gearbox (BTP), the gearbox (BTP) having a lubrication system implemented using an aqueous medium stored in a reserve, in which method a fluid comprising water is injected into the heat engine to increase the power developed by the heat engine without increasing the temperature of a member of the heat engine or to decrease the temperature without modifying the power developed by the engine, the fluid being taken from the reserve.

Method of increasing the safety of a power plant, and a power plant suitable for implementing the method

An epicyclic gear train comprising a sun gear, an outer ring gear, and a plurality of planet gears carried by a common planet carrier. The planet carrier comprises a support and a plurality of spindles carried by the support, each spindle having a carrier segment extending away from the support to a distal end, each planet gear being arranged around a the carrier segment. Each distal end is separated from another distal end that is adjacent thereto by a distance, and the epicyclic gear train includes a holder system for maintaining the distance within a predefined range regardless of the force applied to each spindle.

Epicyclic gear train, a main gearbox, an aircraft, and a method applied by said gear train

A rotorcraft having a fuselage surmounted by a main rotor. The rotorcraft has a first propeller and a second propeller driven in rotation respectively about a first secondary axis of rotation and a second secondary axis of rotation. A mobility system turns the second propeller relative to the fuselage, the mobility system turning the second secondary axis of rotation relative to the fuselage from a first position where the second propeller exerts thrust in a first direction to a second position where the second propeller exerts thrust in a second direction opposite to the first direction.

Rotorcraft having a rotary wing and an orientable propeller, and a method applied by the rotorcraft

The present invention relates to a method of increasing the safety of a power plant () provided with at least one heat engine () and a gearbox (BTP), said engine () driving said gearbox (BTP), said gearbox (BTP) having a lubrication system implemented using an aqueous medium stored in a reserve (), in which method a fluid comprising water is injected into said heat engine () to increase the power developed by the heat engine () without increasing the temperature of a member of the heat engine (), or to decrease said temperature without modifying the power developed by the engine (), said fluid being taken from said reserve ().

An aircraft () provided with a power plant () driving a rotary wing () and at least one propulsion means (') possessing a propeller (&#x2032;), said power plant () including at least one engine (&#x2032;) having an outlet shaft (&#x2032;) driving a drive train () in order to drive said rotary wing (). The aircraft includes one coupling member (&#x2032;) per engine (&#x2032;) provided with a drive shaft (&#x2032;) and with a first toothed wheel () that are coupled together by a clutch () and by a main controllable freewheel () arranged in parallel with the clutch, said drive shaft (&#x2032;) driving at least one propulsion means (&#x2032;) provided with brake means (&#x2032;) for braking its propeller (&#x2032;), said first toothed wheel () meshing with said drive train ().

Rotary wing aircraft provided with propulsion means, and a method applied by said aircraft

A powerplant () is provided with a drive shaft () and at least one engine () having an outlet shaft () that is necessarily set into rotation during starting of the engine (), the drive shaft () being suitable for setting a mechanical system () into motion. The powerplant () includes a link member () having a clutch () and a declutchable freewheel () for mechanically linking the outlet shaft () to the drive shaft ().

Powerplant and a method of driving a mechanical system via said powerplant

A power transmission gearbox for rotorcraft for transmitting rotary movement from at least two engine members to a main shaft, wherein the gearbox presents at least two transmission systems for imparting rotary movement to the main shaft, each of the transmission systems including: an inlet shaft designed to be driven in rotation by an engine member; at least two reduction stages presenting different reduction ratios; a first gearwheel connected to the inlet shaft via a declutchable freewheel, the gearwheel meshing with a first toothed wheel secured to an intermediate shaft defining at least a first reduction stage; a second gearwheel connected to the inlet shaft via a simple freewheel, the second gearwheel meshing with a second toothed wheel secured to the intermediate shaft defining the second reduction stage; a main freewheel mounted on the intermediate shaft to rotate a complementary toothed wheel secured to the main shaft; and a clutch mechanism for the declutchable freewheel.

Power transmission gearbox presenting a modifiable speed of rotation at its outlet, and a corresponding method of operation

A transmission mechanism between at least one accessory and engine members for driving the rotor of a rotorcraft, the transmission therebetween being selectively either in isolation or in combination. An intermediate shaft is interposed between a main drive shaft for the rotor and a secondary drive shaft for the accessory, for driving the accessory from an engine member allocated to driving it. This intermediate shaft engages directly on the main shaft and meshes with an accessory drive gear via freewheels to enable the gear to be driven either by the engine member or from the main shaft in the position for combined drive together with the rotor, the rotor being driven by the other engine member or autorotation in the event of both engine members failing.

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Aix en Provence, France

Michel Vialle