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PIN-WHEEL HOURGLASS WORM GEARING

Hourglass worm 1 rotates about fixed axis A-A and its threads b mesh with cylindrical pins a of pin-wheel 2 which rotates about fixed axis B. Pins a are designed as rollers located on the outside cylindrical surface of wheel 2 and can turn about their axes d, thereby substantially reducing friction losses in the gearing. The transmission ratio of the mechanism is i₁₂=ω₁/ω₂=z₂/z₁ where ω₁ and ω₂ ar…