Second, the planet gear bearings have to play an active role in torque transfer. Planetary systems split the torque insight from sunlight gear amongst the earth gears, which in turn transfer torque to a world carrier connected to the gearbox result. 
The bearings that support the planets on the carrier have to bear the full brunt of that torque transfer.
Or, in extreme cases, they may select angular contact or tapered roller bearings, both which are designed to withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to create around these axial forces for two related reasons. First, there is typically very little room in a planetary gearbox to incorporate the kind of bulky bearings that may tolerate high axial forces.
The existence of axial forces makes things completely different for the bearings that support helical gears. But it is critical to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the additional axial forces total little more than a hassle. Gearbox designers will often upsize the bearings to support the additional forces.
Since they won’t need to withstand any axial forces, spur gear bearings play just a supporting role in the functioning of the gearbox. The bearings simply need to support the rotating gear shafts, however they do not play an active function in torque transfer.
Helical Gears Place Greater Demand on Bearings
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