FIELD: transport engineering; bicycles. SUBSTANCE: invention relates to transmissions with shifted gears. Proposed two-step train has intermediate shaft 5 on which second step drive gear cluster 6 is mounted for axial travel for gear-shifting. Chain 7 preserves its position in plane of wheel driven sprocket 8 owing to stop 13. First step can have two chain drives in which driving sprockets 1 are installed eccentrically on shaft of cranks, each sprocket being coupled with its crank for independent rotation. EFFECT: provision of reliable-gear-shifting and saving of muscular power of rider. 2 cl, 4 dwg
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SU1505832A1 |
