Consider two gears — one large gear on shaft and one small gear on shaft . Shaft applies a torque to the large gear, causing it to rotate at a constant speed.
Since the gear teeth are interlocked, the rotation of the large gear causes the small gear to rotate, imparting a torque to shaft .
Assuming the torque applied to the large gear is known, how do we determine the torque imparted by means of the small gear to shaft ?