Blade hub for rotor of helicopter

摘要

The blades are attached to the hub by flexures instead of the usual hinges. The rotor mast or drive shaft (4) has a flange (3) at the top, forming the rotor head. A flexible rotor head plate (2) is bolted (V2) to the rigid rotor head. It is of cruciform shape, with the inner ends of the rotor blades (5) bolted (V1) to the ends - for a four-bladed rotor. The inner ends of the rotor blades fit over the ends (2.1,2.3) of the flexible rotor head plate (2). A flexible spider plate (1) with four arms (1.1,1.3) is fitted over the inner ends of the rotor blades, and is held by the bolts which fasten the blades to the flexible rotor head plate. The center of the cruciform spider plate is thicker than the arms.