Second, the planet gear bearings have to play an active part in torque transfer. Planetary systems split the torque insight from the sun gear amongst the earth gears, which in turn transfer torque to a planet carrier linked 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 contact or tapered roller bearings, both of which are made to withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to design around these axial forces for two related reasons. 1st, there is typically hardly any area in a planetary gearbox to incorporate the kind of bulky bearings that can tolerate high axial forces.

The presence 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 amount to little more than a hassle. Gearbox designers will most likely upsize the bearings to accommodate the additional forces.

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

Helical Gears Place Better Demand on Bearings

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