Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Snecma

Andre Dhainaut

Guy d'Agostino

Claude M Maillard

Jacques A Petiteau

Daniel Germain Kettler

Henry Roger Leclerc

A modular sub-assembly of a regulator of a pressure drop detector and intated excess speed governor intended for use with turbo-machines. The pressure drop detector and the excess speed governor are supplied in parallel by a common working fluid at a common pressure PF at low flow and the excess speed governor is capable of reducing the pressure of the working fluid by placing it in communication with a pressure PB which is higher when a predetermined excess speed is achieved, in order to reduce the pressure Pmod at the outlet of the pressure drop detector and to reduce the fuel flow delivered to the injector circuit of the turbo-machine.

Hydromechanical governor

The invention relates to an electro-hydraulic governor particularly for a turbo-jet engine. All of the electro-hydraulic or electro-pneumatic equipment units such as solenoid valves are arranged on a common plate face of the governor, the latter being provided with a printed circuit connection plate of which the substrate faces the plate surface. The hydraulic connections are made fluid-tight between the equipment units and the governor by means of apertures with seals therein, which apertures pass through the printed circuit plate.

Electrical and hydraulic connections assembly for an electro-hydraulic

A compound seal for affecting a seal on a translating shaft movable within a sleeve to separate high pressure and low pressure zones. The compound seal includes a sealing member and a clamping member disposed in a groove formed in one of the elements. The sealing member defines sealing sides which cooperate with one of the sides of the grooves and with the other of the elements. The clamping member cooperates with the bottom and the high pressure side of the groove, and with the sealing member so as to exert a force thereon extending substantially along the bisector of an angle defined by the sealing sides.

Compound seal with pressure equalization aperture

A cylinder (3) is positioned to rotate on a fixed axle (1) in such a way that several leakproof chambers (3B, 3D) are formed: a second, longer cylinder (4) is positioned to slide along the first (3) and to turn on the fixed axle (1) in such a way that several leakproof chambers are formed (4A, 4B). Communicating pressurized fluids into the various chambers makes the cylinders (3, 4) turn a distance proportionate to a value x, and can make the second cylinder move axially along the first cylinder a distance proportionate to another value y; these values x and y being derived from several variables and sensors (10a to 10d) 'read' the surface contours of the second cylinder (4), representing, for example, a function f (x,y).

Control mechanism for a tridimensional cam

The invention concerns a fluid distribution device of the type comprising on the one hand, a metallic body with a borehole, in the thickness of which a plurality of channels for the circulation of the fluid is provided, and on the other hand, in the bore of the body a core mobile in rotation or in translation capable of establishing communication between said channels, when the core occupies at least two predetermined positions. The body of the device is constituted by the tight and inseparable joining of at least two elements joined together by contact surfaces of an exactly complementary configuration and at least certain of the channels of the body consisting at least in part of grooves cut into at least one of the contact surfaces.

Device for the distribution of a fluid

A fuel flow control assembly comprises a metering piston which can slide within a casing and defines with that casing an upstream chamber at a pressures P.sub.1 and downstream pressure P.sub.2. Relative movement of the piston and the casing varies the effective opening of a metering orifice and providing that the pressure drop P.sub.1 -P.sub.2 is kept constant the orifice has linear characteristics. The assembly also includes a pressure drop monitor and a slide control valve which uses as its casing an internal bore of the flow control piston. With a view to rendering the assembly more compact the pressure drop monitor is also disposed within the bore of the flow control piston.

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Dammarie les Lys, France

Andre Dhainaut