Asymmetric gas spring
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United States of America Patent
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Apr 2, 1991
Grant Date -
N/A
app pub date -
Jun 25, 1990
filing date -
Jun 25, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a free piston Stirling machine, a gas spring apparatus for applying two distinctly different spring rates to the displacer during the displacer's excursion past a center point in opposite ends of the work space. The apparatus comprises a cylinder formed in a gas spring housing, in which a gas spring piston is slidably mounted. On opposite sides of the gas spring piston there are two unequal volume gas spring chambers. Between the gas spring chambers there is a bleed hole which divides the cylinder into the two chambers and allows communication between the gas spring chambers and a gas reservoir. While the piston is compressing one gas spring chamber, the opposite is in communication with the gas reservoir and vise versa. This creates two distinctly different spring rates applied to the displacer. The two different forces increase and decrease the acceleration of the displacer which creates a more efficient sweeping of the working gas between the hot and cold space, thereby increasing the efficiency and work of the machine.
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