Second, the earth gear bearings need 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 connected to the gearbox result. The bearings that support the planets on the carrier have to bear the entire brunt of that torque transfer.

Or, in extreme cases, they may select angular get in touch with or tapered roller bearings, both which are made to withstand axial loads.
In planetary gearboxes, however, it’s a lot more difficult to design around these axial forces for two related reasons. First, there is typically hardly any area in a planetary gearbox to include the type of bulky bearings that may tolerate high axial forces.

The presence of axial forces makes things completely different for the bearings that support helical gears. But it is important 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 enjoy just a supporting function in the functioning of the gearbox. The bearings should just support the rotating equipment shafts, however they do not really play an active function in torque transfer.

Helical Gears Place Greater Demand on Bearings

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