pic: Team 192's 2013 Gearbox

[sdcantrell56]

Originally Posted by Joey Milia

I don't have any hard data on efficiency but it's just a three stage shifting gearbox, one of which is belts from the cims. All stages are in the 98%-99% range, add on the sealed bearings and I would expect an efficiency in the low 90s.

How are you getting such high efficiency per stage?

[Joey Milia]

The main reductions are spur and bevel gears, which, when alined properly with accurate tooth profiles and proper lubrication are extremely efficient. Once again I have no measured data to support these estimates, they are based on subjective observations and engineering manuals (mostly engineering manuals).