torque transfer question

[gearwhine]

OK I've got quite a few questions about this stuff. They are just general questions, and for now, does not have to deal with a vehicle that is produced....yet.

OK I've got questions about finding your final torque value in inch lbs. Yeah...inch, not foot. Say you have 13.75 ft lbs of torque off the engine main shaft at 2600 RPMS (this is off a 10HP motor) That would be 165 in/s lbs of toruqe. With this torque it will be going through a 3.24 1st gear, a low range of ~4:1, and then a final reduction drive of ~3:1. That would be ~ 6415 in lbs of torque at the final drive by multiplying the initial torque through the gear reductions, is that correct? (166x3.24x4x3) It seems crazy because that's 534.6 Ft. Lbs. of torque at the rear wheels coming from a 10 HP engine, but it is a lot of gear reduction going on.

The torque curve for our engine is here if you need more info for it...like HP.Torqu curve

Another question. There will be two final drives, one to one wheel and one to another, I guess I'll just say axle shafts. Is the Torque put on these shaft split between them and divided by two (this is in a spooled system, no open or LS differentials), or is the full final torque applied to both shafts equally. In other words. Does each shaft get 6415 in lbs of torque or does each shaft get 3207.5 in lbs of torque (torque divided by two)? those are my questions for now. Thanks a whole bunch. _nicko_

 

[HossHoffer]

Numbers

If you have 6415in/lb of torque to the axle then it will measure the same on each side of the axle. However, the sum of torque used by both sides will not be greater than 6415in/lb. I gather that you have a chain drive to the axle with a solid axle to each wheel. Ignoring bearing drag or torsion effects, if you lifted the wheels off the ground then you would measure the same torque on each side because you're reading the torque on the axle as a whole. If you measured the torque on both sides simultaneously then yes you would read close to half the torque on each side. What determines how much force is actually used by each wheel is how well the energy is transferred to the ground at any given moment by each wheel. If one wheel is on sand and one is wedged in some rocks then the torque readings will be different on each side but the sum won't exceed the maximum. There is more to it but that's it in a nutshell.