| 摘要 |
Elimination of a previous intermediate inter-shaft locating bearing 108 allows smaller core sizes to be achieved and avoids relatively sophisticated design complications in order to provide that bearing 108. Thus, an inner shaft 200 is supported at one end by a mounting bearing 205 and at its other end by a spaced bearing combination 220 upon a static cradle structure 221. The spaced bearing combination 220 comprises bearings 222, 223 which can be varied in terms of spacing, stiffness of support upon the cradle 221 and sprung resilience in the bearing races in order to tune shaft vibration to avoid critical frequencies occurring in the normal rotational running range of an engine incorporating the arrangement.
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