Patent ID: 7114912
Filing Date: 2006-10-03
Classification: F01D,F04D,F05B,Y02T

Abstract:
1. An aircraft turbojet comprising: a fan having a hub driven by a shaft carried by at least one bearing connected to a structure of the turbojet by a bearing support that includes an interposed decoupling device, the hub carrying at its periphery a plurality of blades that move inside a retention casing with a first value of radial clearance between tips of the blades and an inside wall of the retention casing, the inside wall being lined in a layer of abradable material configured to be planed away by the tips of the blades, wherein the blades comprise predetermined tip portions configured to be breakable by the inside wall of the retention casing in an event of an impact following an appearance of an unbalance that has led to the bearing being decoupled, to obtain a second value of radial clearance greater than said first value of radial clearance as required for operation of the decoupler.