I am not a mechanical engineer but I love the topic and try to learn as much as I can. I have thought about reducing the usual differential ring and pinion gear diameter to increase ground clearance (and other reasons too lengthy to explain here). I also want to keep the shaft speed as high as possible to reduce torque and keep the parts smaller. I plan to use a portal axle but I want to go further. I am thinking of a differential that is nothing more than a spool/coupling with a spur or worm gear arrangement. The differentiation, will be done in the portals. I just need the best way to drive the spool from the input shaft considering that they are 90 degrees to each other. I have thought of a few ideas, but I think there most likely better ways to do it. I have thought of using a jackshaft parallel to the input shaft that has a worm gear driving the gear on the spool. I have thought of bevel gears (or ring and pinion gears) on a shaft 90 degrees to the input shaft with teeth cut into it on the opposite end of the shaft to drive the spool. I want most of the gear reduction to be in the portals, for various reasons including smaller diameter shafts and larger diameter portal gears that increase the ground clearance even further. Any ideas, suggestions, hints, guidance, observations, critiques, etc. would be greatly appreciated. If you have questions please feel free to ask them.
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