Stress Calculation for Double-D Hub

[MrDMS]

Does anybody know an analytical method of calculating the stresses in a double-D (or single-D) hub when transferring torque from its mating shaft?

 

[plasgears]

The double D is a nice balanced way to transmit torque, and the shaft can be machined by broaching. The remaining shaft is basically a rectangular shaft. Roark gives guidelines on stresses in rectangular shafts. Smax = .25 Syield.

The flats can be defined by 45 deg intercepts; the subtended angle between the corners of the flat is 90 deg. I have used this in plastic shafts, steel shafts driving PM gears, zinc shafts, etc.

 

[MrDMS]

plasgears-

Thanks for your response. How about the stresses in the hub? I am actually analyzing a plastic hub on a steel shaft.

-DMS

 

[plasgears]

The plastic hub is a ring with two opposing forces applied. Roark gives an example of this.