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SINGLE-STAGE WORM REDUCING GEAR MECHANISM

Worm 1 rotates about fixed axis A and meshes with worm wheel 3 which is keyed to shaft 5 and rotates about fixed axis B-B. Also keyed to shaft 5 is worm wheel 4 which meshes with worm 2. Worm 2 rotates about fixed axis C. The transmission ratio of the mechanism is i₁₂=(z₃/z₁)(z₂/z₄) where z₃ and z₄ are the numbers of teeth on wheels 3 and 4, and z₁ and z₂ are the numbers of threads (starts) on wor…