A rotory motion transformer (10) is disclosed which has a cylindrical housing (12) and a rotatable shaft (36). A cam (14) having ascending and descending segments (22-28) forming lobes (30, 32) is included in the housing and axially aligned with the shaft. Equal angular pistons (42-48) are spaced about...http://www.google.es/patents/US4418656?utm_source=gb-gplus-sharePatente US4418656 - Rotary motion transformer
