A flexible coupling for torque transmission between misaligned shafts is proposed. Finite element stress analysis was used to estimate the life of a 0.2-0.3 inch coupling made of mild alloy steel with a 0.01 inch helical cut to manage shaft misalignment. The analysis applied torque loading and misalignment conditions to determine the stress loading and distortion over the expected range of service life.

1. FLEXIBLE COUPLING
FOR
TORQUE TRANSMISSION
2/17/2018 rev A
Don Blanchet
3B Associates
dwb3298@verizon.net
Prepared for Parry Sound LTD Ontario, CA
Estimate life using
Finite element stress analysis

2. Typical Application

3. Rotary motion: managing
shaft misalignment

4. Solid model – mild
alloy steel
0.2 inch to 0.3 inch flexible adapter
Shafts centerlines are misaligned by 0.01 inch

5. Side view .020 helical cut

6. Fea mesh

7. Torque loading
Applied torque
& misalignment Fixed end

8. Magnified distortion

9. Stress loading reversing
fatigue as coupling turns

10. Expected range of
service life