Patent ID: 7524112

Claim:
A bearing support for a rotating engine with a rotating shaft that rotates about a shaft axis, said rotating shaft being supported by at least one bearing and a frame, said rotating engine being capable of running at least two different running speeds, said bearing support comprising: a first mechanical supporting structure with a first stiffness, wherein said first mechanical supporting structure supports said bearing; and a second mechanical supporting structure with a second stiffness, wherein said first and second mechanical supporting structures rotate with respect to each other about said shaft axis such that, in a first rotational position, the first mechanical supporting structure is mechanically coupled to the second mechanical supporting structure such that said second mechanical supporting structure supports said first mechanical supporting structure and, in a second rotational position, said first mechanical supporting structure is mechanically decoupled from the second mechanical supporting structure such that said second mechanical supporting structure does not support said first mechanical supporting structure, wherein the first mechanical supporting structure comprises radial teeth and the second mechanical supporting structure comprises housings cooperating with the radial teeth, and wherein the housings comprise parts cooperating with the radial teeth with a radial clearance to mechanically decouple the first and second mechanical supporting structures from each other, said clearance being greater than an unbalanced mass effects of the rotating shaft.