A speed reducer unit consists of a double-threaded worm of pitch = 11 mm and a worm wheel of pitch diameter = 84 mm. The ratio of the output torque to the input to rque is
(a) 7·6
(b) 12
(c) 24
(d) 42
The question was posed to me in a dream while sleeping
My question comes from Contact Ratio topic in division Toothed Gearing & Gear Trains of Machine Kinematics