FIELD: mechanical engineering. SUBSTANCE: three-speed bushing of driving wheel comprises body with axle inside, a planetary train, a braking device, two free-wheel couplings, and control coupling. The novelty lies in that the free-wheel coupling connecting the epicycle with the body is free to move relative to the epicycle. Besides, the bushing has a toothed cup whose teeth disengage the epicycle-to-body coupling at a low road speed. EFFECT: improved design. 3 dwg
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