Swing-piston engine | Wikipedia audio article
This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Swing-p...
00:01:01 1 Steam engines
00:03:07 2 Internal combustion
00:07:16 3 Other examples
00:08:37 4 Other names
00:08:53 5 See also
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SUMMARY
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A swing-piston engine is a type of internal combustion engine in which the pistons move in a circular motion inside a ring-shaped "cylinder", moving closer and further from each other to provide compression and expansion. Generally two sets of pistons are used, geared to move in a fixed relationship as they rotate around the cylinder. In some versions the pistons oscillate around a fixed center, as opposed to rotating around the entire engine. The design has also been referred to as a oscillating piston engine, vibratory engine when the pistons oscillate instead of rotate, or toroidal engine based on the shape of the "cylinder".
Many swing-piston engines have been proposed, but none have been successful. Two recent (circa 2010) attempts are the prototype American-made MYT engine and protottype Russian ORE for use in the Yo-Mobile hybrid car. Both have claimed high fuel efficiency and high power-to-weight ratio, but there have been no successful demonstrations of claimed efficiency or that the engines are durable enough for practical use.