| 摘要 |
<p>A blade pitch control mechanism for a ram air driven turbine blade (11, 11a) mounted for rotation on a hub assembly (12) having a central axis (26). A governor control member (36), including a seat (38), is mounted on a portion of the hub assembly for reciprocation along the central axis. A first spring (42, 44) acts on a governor control member in a first axial direction. A governor slide member (48) is mounted for reciprocation along the central axis. The blade is in mating engagement (34) with the governor slide member. A second spring (54) acts between the governor slide member and the seat of the governor control member for biasing the slide member opposite the first axial direction. This causes the blade to assume a course pitch when the blade and hub assembly are in storage and to allow the blade to move to fine pitch during start-up. A flyweight (56) is mounted on the hub assembly and engages the governor control member for acting against the first spring to control blade pitch and govern turbine speed after start-up.</p> |
