Second, the planet gear bearings need to play an active function in torque transfer. Planetary systems split the torque insight from sunlight gear amongst the earth gears, which transfer torque to a planet 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 contact or tapered roller bearings, both of which are created to 
withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to create around these axial forces for two related reasons. Initial, there is typically very little 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 completely 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 excess axial forces total little more than an inconvenience. Gearbox designers will often 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 simply need to support the rotating equipment shafts, however they do not play an active role in torque transfer.
Helical Gears Place Better Demand on Bearings
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