rear hub question

[Frank]

assume:
o "bolt-on" cv's/tripods
o (2) deep groove bearings in upright
o spacer between inner races of dreep groove bearings
o two parts transmit the torque from the cv to the wheel ("stubshaft" and "hub")

there's a few ways to transmit the torque from the stubshaft to the hub...

spline
dowels / drive pins
capscrews
key

i hate the capscrew method even more than the key

my question is...

for the teams going this way....

do you find the dowel option lighter / cheaper / easier...?
or is there complications?

kind regards

Frank

[Frank]

assume:
o "bolt-on" cv's/tripods
o (2) deep groove bearings in upright
o spacer between inner races of dreep groove bearings
o two parts transmit the torque from the cv to the wheel ("stubshaft" and "hub")

there's a few ways to transmit the torque from the stubshaft to the hub...

spline
dowels / drive pins
capscrews
key

i hate the capscrew method even more than the key

my question is...

for the teams going this way....

do you find the dowel option lighter / cheaper / easier...?
or is there complications?

kind regards

Frank

[Z]

I am curious as to how FSAE teams do this too...

I can't see the dowel approach being strong enough, especially if using smallish ID ball bearings (how big Frank?). A keyway? Aaack!

The "standard" production car method of an external spline of the CV stubshaft fitting in an internal spline on the hub, which in turn sits in the ID's of the bearings, seems ok to me.

There is also the possibility of a "face spline" (very efficient way of joining two shafts for torque/bending/etc.), but this would require a separate method for clamping the bearing ID's (eg. a standard ring nut from the bearing suppliers).

So how do you guys do it???

Z

[Denny Trimble]

We do splines. The only machining operation we farm out to sponsors...

[Travis Garrison]

Splines are definitely a good way to go, if you can't afford proffesionaly splined stuff, but have CNC access you might look into sinusoidal splines...

[Agent4573]

We send our stuff out to get splined also.

[ben]

We machined the tripod CV profile into the hub and then used the disc bell to clamp against the inner bearing. We did it in steel for two years and the team this year did them in 7075 aluminium and hard anodised it with no problems.

Ben

[Rob.C]

indeed we did ben!

the cv sections were cnc cut into the central peice of our 3 piece hubs, then hard annodised, and have very little signs of wear, deffinitely the lightest way we have found of getting the drive across the back end!

however, inboard end was done using the manufacturers splines.

[kozak]

Do you have any pics of that?

[Rob.C]

i dont have any here, i will have a look in the lab tomorrow! and i may post one on here tomorrow, if i can find a suitable one!