Quote:
Originally Posted by sikeston34m
Yes, I remember this discussion.
I believe what the picture fails to illustrate is:
The back of the can is attached only to the diff housing. The can is attached to the shaft running through it by a bearing only. No longer a press fit with a set screw. Yes, the shaft would basically be traveling through the hollow body of the motor with no coupling whatsoever, besides the bearing at the end.
It would effectively spin the diff housing just like a spur gear spins a center diff.
I believe this design WILL work, but............there's always a but.
Current diff designs do not support this setup. Both in available gear ratios and toughness. But wouldn't this depend on the Kv. of the motor and Volts used? I am sure the ideal unit could be found to match a good racing speed and the correct torque loading to match diffs capacity.
The lowest toughest gear ratio on the market currently is the 13/43 diff setup. I do know MT tires in the 5.75" size won't work with this without cogging. Perhaps a smaller tire size will. This is what I am wondering myself, but haven't you tried this with pretty good success?
Granted, the diff unloading to the front will cut down on some of the abuse. This then switches the game into trying to not make the diff unload.
This center diff will need the thickest grease you can find, and then some. I don't understand why very thick oil would be needed? Standard high viscosity center diff oil will work just as good as in a normal setup, no?
One other thing this setup needs, is a good HV ESC with the Mamba Car Software. Come on Castle. LOL Yeah, the verdict is still out on this one, I think the new ICE controllers might a good choice, if not, maybe the MMM will do just fine with an outrunner?
Some thoughts need to be spent on Motor Cooling also. A fan made into the endbell along with an Aluminum motor mount/chassis will help things greatly. Fins like a Neu would prob work best yeah, planar fins slicing through the air.
A Really Low KV Motor on 8S to 12S would be hard to beat.  |
I also like the idea of a special inrunner motor of relatively high pole count and low Kv. with a large diameter hollow shaft be used. This would take MUCH technical design as the motors output shaft needs to house the diff output, couple to the diff for power transfer, and somehow support the diff all at the same time.
