FIELD: mechanical engineering. SUBSTANCE: toothed rim consisting of removable sections is secured to hub. Changeable sections have trapezoidal projections, and hub is fitted with reciprocal recesses. Toothed sections are attached to hub by means of screws positioned in coaxial holes of sections and hub. Trapezoidal form of projections and recesses prevents radial shift of toothed sections under the action of centrifugal force, as well as their transverse shift relative to hub. EFFECT: improved design. 1 dwg
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