Asymmetric gas spring

Details Asymmetric gas spring Asymmetric gas spring

1990-06-25

1991-04-02

Ostrager, Allen M.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Unit of mass is a gas which is heated or cooled in one of a...

F02G 1045

Patent

active

050037773

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.

REFERENCES:
patent: 4215548 (1980-08-01), Beremand
patent: 4922722 (1990-05-01), Kazumoto et al.
patent: 4945726 (1990-08-01), Beale

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