| 摘要 |
<p>The invention concerns an aircraft turbojet comprising a fan (9) whereof the hub (8) is driven by a shaft on at least a bearing linked to the turbojet structure through a bearing support with an interposed uncoupling device, said hub comprising at its periphery a plurality of blades (1) moving inside a retention casing (4) with a radial clearance E between the tips (2) of said blades (1) and the inner wall (5) of said retention casing (4), said inner wall (5) being lined with a layer (6) of abradable material capable of being planed by the tips of the rotating blades. The invention is characterized in that the tips (2) of the blades (1) are capable of being disintegrated by the inner wall (5) of the retention casing (4) in case of impact resulting from the occurrence of an unbalance causing the bearing to be disengaged, so as to obtain a clearance J > E required for the uncoupling device to operate.</p> |
