Breakable coupling system for a turbojet fan shaft

Details Breakable coupling system for a turbojet fan shaft Breakable coupling system for a turbojet fan shaft

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 21/04 (2006.01) F01D 25/16 (2006.01)

Patent

CA 2473088

The invention relates to a system of arranging a rotating shaft which bears a piece of equipment at one end thereof and which extends backwards from said piece of equipment. The aforementioned shaft (1) is supported by a first bearing (2) which is disposed behind the equipment and by a second bearing (3) which is disposed behind the first bearing (2). Said first bearing (2) is supported by a casing (4) which surrounds the shaft (1) and which extends behind the first bearing (2) to a stator structure (5). The casing (4) is flanged to said stator structure using screws (6) which are parallel to the shaft (2) and which can break under tension. The inventive system is characterised in that the second bearing (3) is disposed with radial clearance (J) inside a bore (7) in an annular support (8) which is solidly connected to the stator structure (5) and in that said bearing is flanged to the annular support (8) using screws (9) which are parallel to the shaft (1) and which can break under shearing force. In this way, the second bearing (3) can rest on said support (8) in the event of screw (9) breakage. The invention is particularly suitable for use as a support for a turbojet fan shaft.

L'invention concerne un agencement d'arbre tournant portant un équipement à un bout et s'étendant en arrière à partir de l'équipement, l'arbre (1) étant soutenu par un premier palier (2) en arrière de l'équipement et par un deuxième palier (3) en arrière du premier palier (2), le premier palier (2) étant porté par une enveloppe (4) entourant l'arbre (1) et s'étendant en arrière du premier palier (2) jusqu'à une structure de stator (5), à laquelle l'enveloppe (4) est bridée par des vis (6) parallèles à l'arbre (2) et fusibles en traction, caractérisé par le fait que le deuxième palier (3) est disposé avec un jeu radial (J) dans un alésage (7) d'un support annulaire (8) solidaire de la structure de stator (5 et est bridé audit support (8) annulaire par des vis (9) parallèles à l'arbre (1) et fusibles en cisaillement, grâce à quoi le deuxième palier (3) est susceptible de prendre appui sur ledit support (8) en cas de rupture desdites vis (9). Elle s'applique plus particulièrement au support de l'arbre de soufflante d'un turboréacteur.

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