Abstract: A Stirling engine seal assembly includes a seal ring body and an expander. The seal ring body consists of a matrix made of polytetrafluoroethylene compounded and filled with carbon fibers and at least one powder selected from the group consisting of carbon powder, boron nitride powder and molybdenum disulfide powder. The plate expander is in abutting contact with the inner peripheral surface of the seal ring body for urging the seal ring body in the direction of its outer circumference.

Abstract: An oil seal assembly includes an oil seal having a lip contacting the outer peripheral surface of a reciprocating shaft, a holder for holding the oil seal about the shaft, and an annular spring for urging the lip against the outer peripheral surface of the shaft. The lip has a flat surface which is inclined with respect to the outer peripheral surface of the shaft. When the oil seal is mounted on the shaft, the flat surface is brought into surface contact with the outer peripheral surface of the shaft by an urging force applied by the spring.

Abstract: A rod seal device for a Stirling engine includes a piston rod connecting operating piston and a guide piston latter being served as a power take-off device, various seal members disposed between the two pistons and surrounding the outer peripheral portion of the rod. The seal device further includes a plurality of chambers disposed around the outer periphery of the rod between a working chamber of the engine and a working chamber of the power take-off for discharging any gas leaked therefrom or preventing any undesired mixture of the two different working gases.

Abstract: A rod seal device for a Stirling engine includes a high pressure oil chamber, an oil seal, and a low pressure oil chamber in series disposed between a compression chamber of the engine and a driving unit of power take-off. The oil seal includes an annular slit open to one end of the low pressure oil chamber for scraping oil from low pressure oil chamber to the high pressure oil chamber.