Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent
1998-02-27
2000-05-23
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
416153, 416 23, 416 39, 60527, 244 75R, B64L 2700
Patent
active
060659343
ABSTRACT:
A rotary actuator (18) is provided, including an actuator assembly (20). The actuator assembly includes a torque tube (24) formed of a shape memory alloy, a super elastic NiTinol return spring (26) having a proximal end (46) and a distal end (44), and a torque tube heating element (30) positioned near the torque tube. The torque tube (24) includes a proximal end (32) and a distal end (34). The return spring and torque tube are connected at their ends, with the torque tube being pretwisted while in a martensitic state relative to the spring. Activation of the heating element causes the torque tube to enter an austenitic state in which it returns to its previous untwisted configuration. Removal of heat allows the torque tube to return to a martensitic state, further allowing the return spring to retwist the torque tube. Further provided is a unique locking assembly (22) for use with the actuator assembly. Further provided is a helicopter blade twist rotation system for use with a rotor craft blade (200) having a blade root (202) and a tip (204). The system includes a shape memory alloy rotary actuator (18) located within the blade near the blade root, and a passive torque tube (206) located within the blade and having a proximal end connected to the rotary actuator and a distal end connected to the blade near to the blade tip.
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Clingman Dan J.
Jacot Arthur Dean
Julien Gerald J.
Look Edward K.
The Boeing Company
Woo Richard
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