| 摘要 |
<p>PURPOSE:To improve the damping effect for vibration through the utilization of contact friction by allowing the convex and the concaved spherical surfaces formed at the top end of the projection part elongayed on the back and belly surfaces of each blade to be linked freely and to be slidable according to all direction of displacement of the blades. CONSTITUTION:On the back surface 3 and the belly surface 2 of a blade 1, projections 4 and 5 are elongated, and the spherical concaved surface 6 and the spherical convex surface 7 are formed on the top surfaces of the projections 4 and 5 respectively. The spherical concaved surface 6 and the convex surface 7 are combined so as to be opposed, keeping a proper gap 7. Thus, even if the movable blade 1 thus incorporated displaces in the direction of arrow (a) due to the untwist generated by a centrifugal force, uniform contact state is usually obtained due to the contact of spherical surfaces of the concaved and convex spherical surfaces 6 and 7, and vibration is absorbed by the friction generated in the sliding of the spherical surfaces.</p> |
