FIELD: machine engineering. SUBSTANCE: automatic gear box includes housing, driving and loading shafts, planetary mechanism and control device. One concentric boss of control device of central gear wheel of planetary mechanism has on outer cylindrical surface closed elliptical groove with semicircular cross section. Movable toothed rim of planetary mechanism has another boss. Semicircular cross section grooves are arranged along generatrices of mounting opening of said another boss. Both bosses are mutually joined by means of balls. EFFECT: enhanced shifting capability, lowered size of gear box. 2 dwg
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