Thanks for every answers.
Actually I am designing gearbox for wind turbine.
And I intend to make 2-stage planetary and 1-helical gears.
1st planetarty stage takes very high torque so I thought double row planetary gear would be good.
But I didn't get "float" meaning. And How can I do that?
How can I control a misalignment when designing a shaft-system with 3set of double-row planet gear?
Input gear : planetary carrier
Output gear: sun gear
side view)
+---p p
l -----
input->--l SUN------>output...