| 摘要 |
An SME actuator is provided by a housing, a plunger axially reciprocal in the housing; a compression spring or Belleville washers biasing the plunger in one direction, SME (shape memory effect) disc washers around the plunger and thermally deformable to move the plunger in the opposite direction, and a concentric electrical resistance heater and/or fluid inlet and outlet ports for thermally actuating the SME disc washers to in turn move the plunger. Multiposition control is provided by a stack of a plurality of SME Belleville disc washers of differing transition temperatures. Alternatively, the washers can all have the same transition temperature and operate proportionally with increasing or decreasing temperatures. Another version is provided by an SME torsion bar and threaded drive element for axially translating the plunger. |
