Second, the earth gear bearings need to play an active function in torque transfer. Planetary systems split the torque input from sunlight gear amongst the planet gears, which transfer torque to a world carrier linked to the gearbox result. The bearings that support the planets on the carrier have 
to bear the entire brunt of this torque transfer.
Or, in acute cases, they could select angular get in touch with or tapered roller bearings, both of which are designed to withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to design around these axial forces for two related reasons. Initial, there is typically hardly any area in a planetary gearbox to include the kind of bulky bearings that may tolerate high axial forces.
The existence of axial forces makes things very different for the bearings that support helical gears. But it is important to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the additional axial forces total little more than an inconvenience. Gearbox designers will most likely upsize the bearings to support the additional forces.
Since they don’t need to withstand any axial forces, spur gear bearings enjoy just a supporting role in the functioning of the gearbox. The bearings should just support the rotating equipment shafts, however they do not play an active role in torque transfer.
Helical Gears Place Greater Demand on Bearings
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