Linear free piston stirling machine
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United States of America Patent
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Issued Date -
Apr 16, 2009
app pub date -
Aug 4, 2005
filing date -
Aug 6, 2004
priority date (Note) -
Abandoned
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Abstract
A linear free piston Stirling machine having a displacer piston mounted on first and second planar springs. The first spring has a stiffness which increases with increasing spring displacement. The second has a stiffness which is less variable with spring displacement to provide a combined stiffness which rapidly increases once the displacer piston displacement exceeds a fixed limit. Each of the springs has a plurality of spiral spring portions and a stress relieving hole beyond the outer edge of the spiral spring portions.
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