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A hydraulic actuator for a multicylinder Stirling engine provided to enable modulation of the displacement of the engine. The hydraulic actuator incorporates a rotary vane configuration which provides relative rotational adjustment between components of a swashplate assembly. The relative rotation p

A hydraulic actuator for a multicylinder Stirling engine provided to enable modulation of the displacement of the engine. The hydraulic actuator incorporates a rotary vane configuration which provides relative rotational adjustment between components of a swashplate assembly. The relative rotation provides adjustments to the angle formed by the swashplate relative to its angle of rotation, and thus varies the stroke of each piston connecting rod, which thereby modulates the swept volume of the respective piston within its cylinder bore.

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1. A swashplate actuator for a Stirling engine of the type having a swashplate rotatable with a driveshaft which rotates about an axis of rotation, a plurality of reciprocating pistons which engage the swashplate though cross heads, and wherein the reciprocating stroke of the pistons is variable as

1. A swashplate actuator for a Stirling engine of the type having a swashplate rotatable with a driveshaft which rotates about an axis of rotation, a plurality of reciprocating pistons which engage the swashplate though cross heads, and wherein the reciprocating stroke of the pistons is variable as a function of the angle formed by the plane of the swashplate to the axis of rotation, the actuator comprising:a driveshaft rotatable about the axis of rotation and having a cylindrical swashplate journal forming a central journal axis inclined from the axis of rotation;a swashplate ring journaled for rotation about the journal axis, the swashplate ring forming a disk which defines the swashplate plane which is inclined from normal to the journal axis and which engages the cross heads, the driveshaft and the swashplate ring cooperating to form an annular hydraulic cavity;a pair of driveshaft vanes diametrically opposed to one another and extending radially outwardly into the hydraulic cavity;a pair of swashplate ring vanes diametrically opposed and extending radially inwardly into the hydraulic cavity, the pairs of vanes dividing the hydraulic cavity into four separated chambers; andfluid supply passageway in the driveshaft including a first passageway supplying fluid to a first pair of the chambers which are diametrically opposed, and a second passageway supplying fluid to a second pair of the chambers which are diametrically opposed, wherein the fluid may be supplied though the first or second passageway to enlarge the first or second pairs of chambers respectively which causes the swashplate ring to rotate relative to the driveshaft journal causing the swashplate plane angle to change. 2. A swashplate actuator for a Stirling engine according to claim 1 further comprising a first and a second supply port for respectively providing hydraulic oil to the first and second passageways, the supply ports communicating with the outside diameter of the driveshaft. 3. A swashplate actuator for a Stirling engine according to claim 1 further comprising a stop block positioned between at least one swashplate ring vane and at least one driveshaft vane for defining a physical stop in the range of relative rotation between the swashplate ring and the driveshaft. 4. A swashplate actuator for a Stirling engine according to claim 1 wherein the engine produces mechanical output power through the pistons engaging the swashplate to urge the swashplate and the driveshaft to rotate. 5. A swashplate actuator for a Stirling engine according to claim 1 wherein the engine is a double-acting type. 6. A swashplate actuator for a Stirling engine according to claim 1 wherein the first and the second passageways are defined by a bore in the driveshaft having a tube installed therein, the tube dividing the bore into the first and the second passageways defined by separating the fluid flowing inside the tube or outside the tube. 7. A swashplate actuator for a Stirling engine according to claim 1 further comprising a hydraulic circuit for supplying the fluid to the first and second passageways including a directional control valve which supplies the fluid under pressure to one of the first or second passageways and allows the fluid in the other of the first or second passageway to be drained thereby causing the swashplate ring to rotate relative to the driveshaft journal. 8. A swashplate actuator for a Stirling engine according to claim 1 further comprising a first proximity probe interacting with the driveshaft for providing an output as a function of the rotated position of the driveshaft and a second proximity probe interacting with the swashplate ring wherein the phase difference in the outputs of the first and second proximity probes provide an indication of the swashplate plane angle.