| 摘要 |
1,216,320. Shafts; damping vibrations; yieldingly mounted bearings. BOEING CO. 28 Dec., 1967 [5 Jan., 1967], No. 58886/67. Headings F2A, F2S and F2U. A drive shaft assembly for operation at super-critical speeds comprises a main drive portion 10 connected at a node 16 by a flexible coupling 13 to a dual member consisting of an inner torque shaft 12 surrounded over a portion of its length by a concentric sleeve 11, the reduced free end 17 of which constitutes an antinode and is connected through a bearing 18 with a viscous shear-type vibration damper 15. The latter comprises two sets of annular discs, each of which is formed from a pair of spaced bi-metallic elements 21, 26, the axial separation of which varies according to temperature to counteract the effect of viscosity changes, the discs flattening from the form shown with increasing temperature to reduce the film thickness. The annular walls 23 of the damper housing are elastomeric. |
