Mounting plate

F'l'i. 5.7. Rulon seal and guide, rings combustion engine practice. Two thin rings of rectangular cross section about 0.24cm (i?in) to 0.32cm (┬┐in) thick will be found more effective than a single thick ring. The rings should be a 'sloppy* fit in the piston ring grooves and .should be supported or backed by some kind of metal spring ring lightly pushing the ring radially outwards. The ring should be split by a radial slit cut into the ring when mounted on a mandrel.

Neither I he ring not the lip seal described above offer guidance to the piston and so it will most likely be found necessary to provide guide rings in addition to the seal rings. In big. 5.7 the guide rings are shown at the axial extremities of the piston. They may be solid rings mounted by adhesive on a mounting plate to the piston. Alternatively, they may be split to facilitate mounting in a ring groove. In cither case the ring should be a snug sliding til in the cylinder and a close (it in the ring groove. The guide ring should be relieved at intervals around the circumference and shaped so the actual circumferential contact of the ring with the cylinder is a line or a small surface area.

lit other engines, particularly free-piston machines, good results can often be obtained with close tolerance seals. A typical design is shown in Fig. 5.8. It consists, simply, of a well-fitting piston sliding within a cylinder, For best results the piston should be of a length that is at least twice the diameter and relieved at intervals along the length by circumferential grooves about 0.16 to 0.24 cm (yt; to ^ in) long and deep. The grooves should be spaced at regular intervals about one half inch (1 cm)

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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