▎ 摘　　要

NOVELTY - An input shaft is locked and fixed by a locking sleeve and a motor shaft. The input shaft comprises 1.2-1.6 wt.% zinc, 2-4 wt.% graphene, 0.1-0.3 wt.% zirconium, 0.25-0.45 wt.% nickel, 0.6-1.3 wt.% silicon, 1-3 wt.% aluminum, 0.2-0.3 wt.% manganese, and balance amount of iron. The ratio of nickel and zinc is 0.17-0.29. USE - Input shaft of speed reducer. ADVANTAGE - The input shaft has excellent tensile strength, yield strength, corrosion resistance and thermal expansion resistance, and is operated more stably with reduced noise by locking sleeve structure. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacturing method of input shaft.