Second, the earth gear bearings have to play an active function in torque transfer. Planetary systems split the torque input from sunlight gear amongst the earth gears, which transfer torque to a world carrier linked to the gearbox output. The bearings that support the planets on the carrier need to bear the full brunt of that torque transfer.

Or, in acute cases, they may select angular contact or tapered roller bearings, both of which are designed to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to create around these axial forces for two related reasons. Initial, there is typically hardly any room in a planetary gearbox to incorporate the type 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 critical to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the additional axial forces amount to little more than a hassle. Gearbox designers will most likely upsize the bearings to accommodate the additional forces.

Since they won’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 part in torque transfer.

Helical Gears Place Better Demand on Bearings

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