spline slippage calculation
spline slippage calculation
(OP)
here's a challenging problem.
How would one calculated the min axial force required to cause an involute spline to slip under a continuous torque. This is for a long drive shaft with male spline on one end mating with a female spline (with roon for axial movement). The design requires that the drive shaft be allowed to move axially while turning to accomodate intermittant thrust loads. The only givens are the spline design dimensions and the Torque and RPM for the drive.
Egads! I'm having college flashbacks!!
Thanks in advance for any help.
How would one calculated the min axial force required to cause an involute spline to slip under a continuous torque. This is for a long drive shaft with male spline on one end mating with a female spline (with roon for axial movement). The design requires that the drive shaft be allowed to move axially while turning to accomodate intermittant thrust loads. The only givens are the spline design dimensions and the Torque and RPM for the drive.
Egads! I'm having college flashbacks!!
Thanks in advance for any help.





RE: spline slippage calculation
Cheers
Greg Locock
RE: spline slippage calculation
But I still need to calculate the spline tooth load under the given torque and speed. What formula would you recommend to derive the tranmitted load? I know that the lewid formula is used for spur gears. Would this apply to splines which have a much higher contact area??
Keith
RE: spline slippage calculation
RE: spline slippage calculation
so it is the same formula as for a spur gear.
Take care
RE: spline slippage calculation
RE: spline slippage calculation
Cheers
Greg Locock
RE: spline slippage calculation
Thanks to all
RE: spline slippage calculation
If not then your spline will tend to lock up as described. Then a couple of things can happen: (a) something breaks or (b) other compliances in the system accomodate the axial motion or thermal growth, until the axial force exceeds the breakaway force. You can deliberately engineer the latter by making sure there is a flexible mounting for one machine or the other, or by putting a compliant joint into the driveshaft.
Cheers
Greg Locock
RE: spline slippage calculation
The shaft in question has flexible diaphragms on both the driven and driving ends. These diaphragms are very stiff torsionally but can accomodate axial deflections. the torque load is steady (from an turbofan engine). Axial deflections will be intermittant due to accelerations during certain manuevers. My job (should I choose to accept it) is to calculate the axial force required to compress or extend the diaphragms. I think i have a good idea now.
thanks,
keith