FIELD: mechanical engineering. SUBSTANCE: proposed turbomachine step-up contains housing with cross splits, drive and output shafts, gear trains made of cylindrical herringbone gears of step-up gear first and second stages interconnected by torsional splined shafts. Gear train is made multiflow, mainly, threeflow. Gears, drive and output shafts are installed on antifriction bearings. First stage gear train is made reducing, with gear ratio of 1.0857-1.6428. Gear ratio of second stage is 0.3067-0.6081. Gear ratio of step-up gear is 0.333-0.999. Invention makes is possible to increase service life of step-up gear to service life of turbomachine. EFFECT: improved reliability of step-up gear. 2 cl, 3 dwg
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