Second, the planet gear Helical Gearbox bearings have to play an active part 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 output. The bearings that support the planets on the carrier need to bear the entire brunt of this torque transfer.

Or, in acute 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 a lot more difficult to create around these axial forces for two related reasons. Initial, 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 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 often 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 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 Higher Demand on Bearings