Thank you for this critical information! Especially for people with high powered, 4 door and long bed pickups. Makes me reconsider a 2 piece drive line for sure.
In our helicopters, we have 9 huge chromoly steel driveshafts (+2 combining engine xmsn shafts) instead of 1 super long driveshaft. What Boeing did to alleviate the bowing from turning 15000rpm (geared down to rotor RPM of course) and 10000shp continuous, is added a balanced flexpack to segmented and braced areas in the driveline. Ive been thinking how useful it would be to add those to big power cars, keeps the driveshafts relatively short and strong, but allows limited movement at very high loads while keeping rigidity at the terminal end of the driveline. I can send yall pics of our driveshaft flexpacks if yall wanted to develop something like that.
Interesting, according to google images it looks pretty much like a guibo style setup(a cylinder-ish shaped chunk of rubber that the driveshaft flange bolts to that's used in place of a U-joint - luxury car thing, "smoother, quieter, blah blah blah"), just with a stack of sheet metal instead of a round(ish) chunk of rubber
I think you would be pretty shocked with how much a driveshaft actually flexes under load. They do not stay straight. If you could have a straight edge on it while it's turning, you would see it turns into licorice. The longer it is, the worse the effect. in the 4x4 world, it's more from shock loading(wheel hop or bouncing over an obstacle), but it's the same result.
Im trying to figure out a problem with my 5" x 75" driveshaft i put on my 2nd gen dodge 4x4 5 speed with a 12v cummins. At around 35mph under load i get a loud noise i can only describe as a concrete saw sound. Definitely an aluminum sound. I have zero vibration, in fact, my truck has never been smoother. My angles are nearly perfect. Is this just the drivetrain noise being amplified through the giant hollow tube, or is it something else? How can i eliminate it? because i hate it lol. I feel like trying to add a strip of sound deadening to it to see if it helps.
Thank you for this critical information! Especially for people with high powered, 4 door and long bed pickups.
Makes me reconsider a 2 piece drive line for sure.
In our helicopters, we have 9 huge chromoly steel driveshafts (+2 combining engine xmsn shafts) instead of 1 super long driveshaft. What Boeing did to alleviate the bowing from turning 15000rpm (geared down to rotor RPM of course) and 10000shp continuous, is added a balanced flexpack to segmented and braced areas in the driveline. Ive been thinking how useful it would be to add those to big power cars, keeps the driveshafts relatively short and strong, but allows limited movement at very high loads while keeping rigidity at the terminal end of the driveline. I can send yall pics of our driveshaft flexpacks if yall wanted to develop something like that.
Interesting, according to google images it looks pretty much like a guibo style setup(a cylinder-ish shaped chunk of rubber that the driveshaft flange bolts to that's used in place of a U-joint - luxury car thing, "smoother, quieter, blah blah blah"), just with a stack of sheet metal instead of a round(ish) chunk of rubber
Thanks for the explanation.
Really interesting stuff. I watch tons of automotive content but non go into drive shaft details like these guys.
Great content, thanks.
Thanks 👍
Great info to have. Thanks.
I just had a driveline failure last weekend. I wish I had done a bit of homework and found you first!
Thanks for the content-can I correctly suppose that critical speed increases with pipe diameter…?
Question answered-thanks…
Thanks for upload, very interesting. 2 piece in general heavier ?
That hit cross member creasing it first
I think you would be pretty shocked with how much a driveshaft actually flexes under load. They do not stay straight. If you could have a straight edge on it while it's turning, you would see it turns into licorice. The longer it is, the worse the effect. in the 4x4 world, it's more from shock loading(wheel hop or bouncing over an obstacle), but it's the same result.
😮😮😮😮
Why isn't a driveshaft speed limited to the u-joint max operating speed (i.e. 5,000 for 1350) instead of the critical speed?
HP sells car TQ wins races. A lot of people forget that even people that race.
Im trying to figure out a problem with my 5" x 75" driveshaft i put on my 2nd gen dodge 4x4 5 speed with a 12v cummins. At around 35mph under load i get a loud noise i can only describe as a concrete saw sound. Definitely an aluminum sound. I have zero vibration, in fact, my truck has never been smoother. My angles are nearly perfect. Is this just the drivetrain noise being amplified through the giant hollow tube, or is it something else? How can i eliminate it? because i hate it lol. I feel like trying to add a strip of sound deadening to it to see if it helps.
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