Can anyone from Autodesk help me? In the design accelerator , when entering data, the software calculates it as being a pair of helical bevel gears, however, when modeling the 3D, it presents the teeth as if it were a spiral bevel gear. Why this? See below the images of a helicoidal bevel gear and a spiral bevel gear.
There is no such thing as a helical bevel gear, helical gears are only possible on parallel gearsets.
All bevel gears with angled thrust faces are called spiral; those thrust faces however can be straight, curved, involute, etc depending on how they're machined, see below.
If my thinking is correct, spiral bevel gears with straight cut thrust faces will only mesh correctly on equally sized gears (same tooth count, same pitch diameter & same pitch angle).
Thanks for the answer. See the images below. Can you recommend a technical book or even a standard that deals with this subject that you informed me above?
After having a play with the design accelerator for the first time, it looks like the bevel gear set you've shown cannot be modelled exactly with the accelerator, they can be approximated though.
What I did is:
- First generate the gear set with the known values (or guessed values in my case).
- Then open (or activate) one of the gears and find the sketches "3D Sketch Right" and "3D Sketch Left".
- Edit the sketches by adding a straight line between the end points of the helical curves and change the helical curves to construction.
- The "Loft Right" or "Loft Left" feature will then fail, edit it and change the Centre Line curve to the new straight line.
- Repeat for the other bevel gear and Voila!
