CV Max Angle

[Funky Town]

We're a first year team and are planning on using an RCV FSAE axle kit http://www.taylor-race.com/pdf/ACDSee_32_print_job.pdf for our drivetrain. The maximum allowable angle allowed in the CV joints supplied with this set-up is 7 degrees. At full droop(which we will probably never hit) we are calculating an angle of 8.5 deg.

Is it a huge problem to exceed the maximum allowable angle infrequently? Or are our CV joints going to tear themselves apart?

[Funky Town]

We're a first year team and are planning on using an RCV FSAE axle kit http://www.taylor-race.com/pdf/ACDSee_32_print_job.pdf for our drivetrain. The maximum allowable angle allowed in the CV joints supplied with this set-up is 7 degrees. At full droop(which we will probably never hit) we are calculating an angle of 8.5 deg.

Is it a huge problem to exceed the maximum allowable angle infrequently? Or are our CV joints going to tear themselves apart?

[terra_dactile]

hi funky town,
Once you get to competition will surely meet the guys from Taylor Race Engineering and you will see that they are super cool and helpfull to any teams in need of advice, their contact number is 972-422-0567 for tech support, im a 100% certain that they will be more than happy to help you with any questions you have.


Jude Berthault
ETS Formula SAE
Steering and Brake System leader

[absolutepressure]

Man, 8.5 sounds like a LOT. We only have about 1-2 degrees of deflection.

[Jon_Dal]

What kind of travel does your suspension have?

[Cement Legs]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by absolutepressure:
Man, 8.5 sounds like a LOT. We only have about 1-2 degrees of deflection. </div></BLOCKQUOTE>

For one inch of travel at 1 degree rotation your drive shaft would have to be ~57 inches.... Thats quite the track! http://fsae.com/groupee_common/emoticons/icon_wink.gif

Quick calcs without accurate shaft lengths (for our shorter shaft) gives me 3.6 degrees each way, jounce and rebound, or a little ~7.2 degrees from bumper to bumper.

Hats off to the gentlemen at Taylor Race for adapting rear end components to fit the FSAE popular Torsen differential. The design of these components has become so standard that it will be one less thing to spend time on to free up more testing in the end. Plus its also nice to see products being made available based on FSAE need. If thats not specifically what they are meant for dont tell me... I'm in my happy bubble http://fsae.com/groupee_common/emoticons/icon_cool.gif

[absolutepressure]

Maybe I'm not understanding. I thought you were talking about deflection while cornering.

And full droop? Since we don't take it off any sweet jumps, I dont see that as being a problem. I think you'd want to look at max vertical angle if you hit any bumps. I didn't design our suspension, but I remember hearing 1-2 degrees of deflection-could have been cornering, idk.

[Scotty82]

Funky T..

You can machine off some material on both inner and outer housings to increase your overall max angle.The RCV housings are very deep and allow lots of plunge.I do not know what the ratio would be ( inch per degree ) If you do machine off the lip that the boot slips over though you will have to make sure you really get em tight.Disconnect the shock and move the wheel through its range of motion and take off alittle at a time.
I will be back in the shop on Monday if you want to give me a shout.

Scotty
Taylor Race Engineering

[Bill Kunst]

hey absolutepleasure,
Did you count on the axles being different lengths? The plunge and angle deflection will be different for both if not. I think most peoples axle lengths are somewhere around 15 to 20 inches. That would work out to roughly 6-7 degrees over two inches of travel. How many teams have more than 2 inches of travel? Check it out before you are sold on thiings being good. Also, don't plan for theroetical corenering deflection, there is more happening dynamically than just that. Plan for the max travel of your suspension, than verify.
Bill

[Cement Legs]

Our stops will compress at least 1/4", a little more even, so that would give us a little more than 2 1/2" total travel.