Second, the planet gear bearings need to play an active function in torque transfer. Planetary systems split the torque input from sunlight gear amongst the earth gears, which transfer torque to a world 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 extreme cases, they may select angular contact or tapered roller bearings, both which are created to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to create around these axial forces for two related reasons. 1st, there is typically very little room in a planetary gearbox to include the type of bulky bearings that can tolerate high axial forces.

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

Helical Gears Place Higher Demand on Bearings

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