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A free piston Stirling cycle machine is illustrated by an engine that utilizes an axially movable displacer subjected to working gas pressures. A primary hydraulic circuit hydrostatically couples a displacer drive rod integral with the displacer to a counterbalance illustrated in the form of a scotc

A free piston Stirling cycle machine is illustrated by an engine that utilizes an axially movable displacer subjected to working gas pressures. A primary hydraulic circuit hydrostatically couples a displacer drive rod integral with the displacer to a counterbalance illustrated in the form of a scotch yoke. The counterbalance stabilizes and controls the Stirling cycle engine by constraining the displacer\s reciprocating axial motion in a repetitive pattern. A throttling valve interposed in the primary hydraulic fluid circuit is used to adjustably resist displacer motion as required by engine operating conditions. A secondary hydraulic circuit is provided together with a bellows assembly between the working gas and power pistons to convert changes in working gas pressure to usable power output in the form of pumped hydraulic fluid.

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A free piston Stirling cycle machine, comprising: a displacer cylinder having a central cylindrical axis; a displacer located within the displacer cylinder and movably mounted along the axis; an enclosed gas spring; working gas means including an enclosed volume of pressurized working gas directed t

A free piston Stirling cycle machine, comprising: a displacer cylinder having a central cylindrical axis; a displacer located within the displacer cylinder and movably mounted along the axis; an enclosed gas spring; working gas means including an enclosed volume of pressurized working gas directed to opposite axial ends of the displacer for cyclically reciprocating the displacer along its axis in a Stirling cycle mode of operation; counterbalance means mounted for axial motion directly related to that of the displacer, stabilizer means mechanically coupled to the counterbalance means for cyclically constraining reciprocating axial motion of the counterbalance means in a repetitive pattern; and hydrostatic fluid means operatively coupling the counterbalance means to the gas spring for accommodating fluid volumetric displacement due to engine operation, the hydrostatic fluid means also being operably coupling the displacer and counterbalance means for imparting axial movement between them.