FIELD: mechanical engineering. SUBSTANCE: ring gear has toothed rim with central disk and radial rigidity ribs. Toothed rim is formed from interconnected sections, has cylindrical profile, and its inner surface is provided with circular thickened portion of cylindrical shape at one side of central disk and conical shape at other side of central disk, with thickened part being oriented to center of rim. Central disk is provided with rigidity belt positioned in its lower part and joined to connecting flange. Parameters of ring gear constructional parts are bound with predetermined relations. EFFECT: increased load bearing capacity, simplified mounting and dismantling of ring gear and shape suitable for casting. 2 dwg
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