Quote:
Originally Posted by lincpimp
The idler gear has no effect on the ratio in the tranny. Emaxx 2nd gear has an 18t top gear and a 31t bottom gear. The ratio is 1.7222222 = 31/18. Because both gears engage the idler it spins at the same rpm. This is true of any 3 gear tranny. The idler is only used to space out the two gears for packaging reasons.
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Its true it has no effect on ratio, as both gears are directly tied to the idler, but nearly every tranny I've seen has an idler, so was wondering if there is some engineering purpose other than a spacer. They do reverse the direction of rotation as well. Many brushed motor have timing in the end bells, so perhaps its there to make sure that the rotation is the same direction as travel, instead of requiring an unconventionally built brushed motor. Obviously w/ BL or 0* this is not needed.
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