| 摘要 |
PURPOSE:To heighten both rigidity and vibration damping effect of a group of moving blades by forming a plurality of indents at the crest part of a tenon of a moving blade cover, which is inserted into a hole formed on the moving blade, so that untwisting deformation of each blade under rotation becomes uniform. CONSTITUTION:The tenon of a moving blade cover is inserted into a lateral hole 3b formed at the trailing edge side of the moving blade. A plurality of indents 11 are formed on the crest part of the tenon in such a manner that the indent 11 is shallower as it is closer to the trailing edge 10 of the blade. The tip of the tenon is expanded as shown by the broken lines in the figure in order to fix the moving blade cover. By providing a plurality of indents like this, the sectional rigidity of the caulked part becomes almost equal in both longitudinal and lateral directions, thereby keeping the untwisting deformation not-too-tight and uniform during rotation. |
