Spur Gear Stress Calculation
Spur Gear Stress Calculation
(OP)
Hey everybody,
So a quick overview, currently at my internship I'm helping the mechanical engineer with some stress analysis on gear teeth. I can't get into the details of the design because it is all proprietary and somewhat confidential information, but essentially it is a change gear (spur gear with an inner keyway) that is subjected to stress with a dog brake periodically. It's in a motor that has a solenoid brake system that engages the change gear with a dog to hold the gear in place and then is released to continue motion.
My question is, how can we accurately calculate/model the stresses the gear is subjected to? We've attempted the AGMA method and the lewis equations but we're finding discrepancies in our calculations. I think because the AGMA method factors in fatigue stresses and is intended for gears that are constantly meshing. This application is more like shock loading when the brake is engaged. We have calculated the transmitted force and picked a gear with the specifications we want, we just need an adequate formula to quantify the stresses for our design. Any help would be greatly appreciated.
So a quick overview, currently at my internship I'm helping the mechanical engineer with some stress analysis on gear teeth. I can't get into the details of the design because it is all proprietary and somewhat confidential information, but essentially it is a change gear (spur gear with an inner keyway) that is subjected to stress with a dog brake periodically. It's in a motor that has a solenoid brake system that engages the change gear with a dog to hold the gear in place and then is released to continue motion.
My question is, how can we accurately calculate/model the stresses the gear is subjected to? We've attempted the AGMA method and the lewis equations but we're finding discrepancies in our calculations. I think because the AGMA method factors in fatigue stresses and is intended for gears that are constantly meshing. This application is more like shock loading when the brake is engaged. We have calculated the transmitted force and picked a gear with the specifications we want, we just need an adequate formula to quantify the stresses for our design. Any help would be greatly appreciated.





RE: Spur Gear Stress Calculation
Without a drawing and some numbers; nobody here is going to be able to give you much help.
It sounds like it's a static load so the Lewis equations will show you how to treat a single tooth as if it were a beam.
Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
RE: Spur Gear Stress Calculation
It will be a great learning experience and you should be able to complete the task before you go back to school in the fall.
Best of luck to you.
Terry
RE: Spur Gear Stress Calculation
RE: Spur Gear Stress Calculation
The answers you seek are likely within, and more.
James Spisich
Design Engineer, CSWP