SMF actuator
US4836496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Aug 27, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF03G7/0633
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An SME actuator is provided by a housing (14), a plunger (12) axially reciprocal in the housing, a compression spring (16) or Belleville washers (60) biasing the plunger in one direction, SME (shape memory effect) disc washers (18) around the plunger and thermally deformable to move the plunger in the opposite direction, and a concentric electrical resistance heater (36) and/or fluid inlet and outlet ports (8, 10 or 86, 88) for thermally actuating the SME disc washers to in turn move the plunger. Multi-position 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 (96) and threaded drive element (104) for axially translating the plunger (112).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.