Actuator

Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – Temperature or fluid force responsive member

Reexamination Certificate

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Details

C416S023000, C416S029000, C416S22300B, C060S527000, C060S528000

Reexamination Certificate

active

08043045

ABSTRACT:
Actuators utilising shape memory alloy materials are known with regard to gas turbine engines. Such shape memory alloys have been used with respect to deformation provided in vanes and blades as well as nozzle elements in order that variations can be made in engine configuration dependent upon thermal cycling. Unfortunately, pedestals in order to provide spacing between the shape memory alloy and an antagonistic bias has resulted in uneven stress distribution as well as a higher thermal mass for the shape memory alloy. An uneven stress distribution will limit operational life whilst a higher thermal mass will result in slower reaction times. By separation of the shape memory alloy or material from its antagonistic bias through use of a slide element, a reduction in thermal mass is achieved and, more importantly, stress differentiation across the actuator is reduced.

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European Search Report for corresponding European Application (completed Jan. 25, 2011).

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