Engine 2014: Steam Plants

1. A External teeth on the floating member are allowed to slide between internal teeth on the shaft rings.
2. B Each gear is allowed to slide on its shaft between retaining collars.
3. C A coupling permits free relative radial motion of the gear  and pinion, thereby allowing axial movement.
4. D Opposing helices act to balance axial thrust with the coupling.

Tip: press A-D to answer