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 transfer torque to a world carrier linked to the gearbox result. The bearings that support the planets on the carrier have to bear the full brunt of this torque transfer.

Or, in extreme cases, they may select angular get in touch with or tapered roller bearings, both of which are designed to withstand axial loads.
In planetary gearboxes, however, it’s much more difficult to create around these axial Helical Gearbox forces for just two related reasons. 1st, there is typically hardly any space 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’s important to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the additional 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 perform just a supporting part in the functioning of the gearbox. The bearings simply need to support the rotating gear shafts, however they do not really play an active role in torque transfer.

Helical Gears Place Greater Demand on Bearings