FIELD: machine engineering. SUBSTANCE: variable speed automatic transmission includes housing, driving and driven shafts, two successively arranged cylinders, common bushing arranged concentrically with cylinders and balls. Driving and driven cylinders are embraced by closed elliptical grooves with semicircular cross section. Along generatrices of mounting opening of bushing there are rectilinear semicircular cross section grooves. Ball placed into elliptical and rectilinear grooves of cylinders and bushing performs complex motion. EFFECT: possibility for making small-size variable-speed automatic transmission. 4 dwg
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