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

Or, in extreme cases, they may select angular get in touch with or tapered Helical Gearbox roller bearings, both which are created to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to design around these axial forces for just two related reasons. Initial, there is typically hardly any area in a planetary gearbox to incorporate 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’s 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 most likely upsize the bearings to support the additional forces.

Since they don’t need to withstand any axial forces, spur gear bearings play just a supporting part in the functioning of the gearbox. The bearings should just support the rotating equipment shafts, but they do not play an active function in torque transfer.

Helical Gears Place Higher Demand on Bearings